The statement about cellular respiration that is not true is this: KREB'S CYCLE ACTIVITY IS DEPENDENT SOLELY ON AVAILABILITY OF SUBSTRATES; OTHERWISE IT IS UNREGULATED.
Kreb's cycle refers to the series of biochemical reactions through which humans generate energy in the presence of oxygen via the oxidation of acetyl COA.
The major factors that regulate the Krebs cycle is the concentration of ATP and NADH. The cycle is strictly controlled based on the level of energy available in the cells. The key regulatory enzymes for the cycle are isocitrate dehyrogenase and alpha ketoglutarate deydrogenase.
The false statement about cellular metabolism is that the Krebs cycle activity is solely dependent on the availability of substrate and is otherwise unregulated. In actuality, Krebs cycle activity is regulated by enzyme activity and cellular energy needs, especially levels of ATP, NADH, and FADH2.
Explanation:The false statement among the given options about cellular metabolism is B) 'Krebs cycle activity is dependent solely on availability of substrate; otherwise it is unregulated.' This is not accurate because Krebs cycle activity is regulated not just by substrate availability but also by enzyme activity and the cellular energy needs, especially those of ATP, NADH, and FADH2. Furthermore, when energy levels are high, the cycle is inhibited.
Regarding the other statements, they are correct. A) Glycolysis is indeed inhibited when energy levels are abundant as excess energy signals the cell to slow down the breakdown of glucose. Similarly, C) In the electron transport chain, electrons do decrease in energy as they are shuttled from one electron carrier to another, converting stored energy to ATP. Lastly, D) The reactions of the Krebs cycle do take place in the mitochondrial matrix, specifically the matrix of the mitochondria where enzymes necessary for the cycle are located.
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How are bones involved with body movement
The Musculoskeletal System Provides Form, Support, Stability, And Movement For The Body. It Is Made Up Of The Bones Of The Skeleton, Muscles, Cartilage, Tendons, Ligaments, Joints, And Other Connective Tissues And Organs. The Bones Are Moved By Muscle Contractions.
How do enzymes speed up biochemical reactions?
by the lowering of activation energy if not i'm sorry
Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. Crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. Crinoids were most abundant in Pennsylvania during the Mississippian Period, which ranged from 375 to 320 million years ago. Fossils of the crinoids shows that during most of this time Pennsylvania was ________ that provided favorable conditions for crinoid growth
The correct answer is - under water.
During the Mississippian Period, the climate on the Earth, as well as the shape of the continents and the oceans was not as it is nowadays, in fact it was much different, unrecognizable by their shapes in the present.
Pennsylvania was not part of the land in this period, but instead it was part of the ocean, thus it was under water. Since it was close to the coastline, it was very rich in life, organisms of all types lived in it. One of those organisms that thrived were the sea lilies. They had perfect conditions, so they were one of the most common organisms in this area in the Mississippian Period, thus there's lot of fossil remains from them from this geological period.
Pennsylvania was covered by a shallow sea during the Mississippian Period, which provided favorable conditions for crinoid growth. Crinoids are not plants but echinoderm species that appeared like sea plants. They use holdfasts to anchor themselves to the sea floor.
Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. Crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. Crinoids were most abundant in Pennsylvania during the Mississippian Period, which ranged from 375 to 320 million years ago. Fossils of the crinoids show that during most of this time Pennsylvania was covered by a shallow sea that provided favorable conditions for crinoid growth.
A skin cell in g2 of interphase has _____ as much dna as it had in g1.
A skin cell in G2 of interphase has twice as much DNA as it had in G1.
A skin cell is somatic cell that undergoes mitosis (cell division). Mitosis together with interphase is part of the cell cycle.
Interphase also known as a phase for the preparation for division consists of three phases:
• G1- cell becomes larger, copies organelles, and makes the building blocks necessary for the new cell
• S-cell copies its DNA in the nucleus (that is why G2 phase has twice as much DNA as it had in G1)
• G2 – cell continues to grow, makes proteins and organelles.
During the mitosis, the cell separates its DNA into two and divides its cytoplasm, forming two new daughter cells.
"The correct answer is that a skin cell in G2 of interphase has twice as much DNA as it had in G1.
The cell cycle is a series of events that cells go through as they grow and divide. Interphase is the phase of the cell cycle during which the cell grows, performs its normal functions, and prepares for cell division. Interphase is divided into three stages: G1 (first gap), S (synthesis), and G2 (second gap).
During the G1 stage, the cell grows in size and synthesizes various enzymes that are required for DNA replication. The amount of DNA in a cell during G1 is 2C, where C represents the amount of DNA in a haploid cell (the amount of DNA in one set of chromosomes).
In the S phase, DNA replication occurs, and the amount of DNA in the cell doubles. Each chromosome is replicated to form two identical sister chromatids, and the cell now contains 4C amount of DNA.
By the time the cell enters the G2 phase, it has completed DNA replication, and the amount of DNA remains at 4C. Therefore, a skin cell in G2 has twice as much DNA as it had in G1, because it has replicated its DNA during the S phase.
To summarize:
- In G1, the cell has 2C DNA.
- In S, the cell replicates its DNA, resulting in 4C DNA.
- In G2, the cell has completed DNA replication and still has 4C DNA.
Thus, a skin cell in G2 of interphase has twice the amount of DNA as it had in G1."
The presence of vascular tissue allowed plants to ________. the presence of vascular tissue allowed plants to ________. transport nutrients and water from below-ground tissues and use them to protect developing embryos transport nutrients and water from below-ground tissues to above-ground tissues and grow taller absorb nutrients from the soil and form a symbiosis with fungi release toxins into the soil that reduced competition with other plants by poisoning nearby plants
Transport nutrients and water from below-ground tissues to above-ground tissues and grow taller.
Explanation;Xylem and phloem form the vascular system of plants to transport water and other substances throughout the plant.Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants.Vascular plants are able to grow higher than other plants due to the rigidity of xylem cells, which support the plant.The presence of vascular tissue allowed plants to transport nutrients and water from below-ground tissues to above-ground tissues and grow taller. This adaptation enabled plants to grow larger and survive in diverse terrestrial environments by distributing essential resources throughout their bodies.
Vascular tissues, including xylem and phloem, form a plant's "plumbing system." They carry water and minerals from the soil to the leaves for photosynthesis and transport food produced by photosynthetic cells to other cells for growth and storage.
These adaptations enable plants to distribute essential resources throughout their bodies, resulting in the ability to grow larger and survive in varied, often harsh, terrestrial environments.
Initially, early land plants were limited in height and primarily competed for light close to the ground. The evolution of vascular tissues allowed them to develop taller structures, enabling better access to sunlight and promoting further growth and diversification.
Additionally, rigid molecules like lignin within the vascular tissues provided necessary structural support for these larger forms. Vascular tissues also provided structural support through molecules like lignin.
The observed results of an experiment that occur from changes in the independent variable are known as _______. A. Controlled variables B. Dependent variables C. Trials D. Constants
Dependant variable as it is what is measured
In an experiment, the observed results that change due to variation in the independent variable are known as dependent variables. The dependent variable depends on the independent variable which is manipulated.
The observed results of an experiment that occur from changes in the independent variable are known as Dependent Variables. In any scientific experiment, the independent variable is the factor that the researcher controls and manipulates, while the dependent variable is the observed result that changes due to the changes in the independent variable. For example, if one is testing different amounts of fertilizer (independent variable) on plant growth (dependent variable), the growth of the plant is the dependent variable because it depends on the amount of fertilizer used.
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The results of human activity on the natural environment are called _[blank]_ effects.
anthropogenic
anthropometric
anthropomorphic
anthropological
Answer: anthropogenic
Explanation:
The effect of human activity on the environment is called as anthropogenic.
Anthropogenic impacts can be on the ecosystems, biodiversity, and on natural resources. The human activities such as forests fires, deforestation, pollution are anthropogenic activities.
Which of the following statements about transmembrane proteins is correct?
a. The signal sequences are always cleaved off.
b. They are always inserted with the amino terminus on the lumenal side and the carboxyl terminus in the cytosol.
c. They cross the membrane only once.
d. They usually have one or more α helices spanning the membrane bilayer.
Answer:
The correct option is D.
Explanation:
There are different types of proteins in cells, one of these is integral proteins. Integral protein perform diverse functions in the cells such as transporters, linkers, ion channels, receptors, etc. Trans-membrane proteins are integral proteins, they are a kind of proteins that are permanently attache to the membranes of the cells and they span the entirety of the cells they are attached to.
The properties of trans membrane protein include the following:
1. They typically have one or more alpha helices spanning the membrane layer.
2. They have both hydrophobic and hydrophilic regions.
3. Each of the proteins have 3 distinct domains, which are intracellular, extracelllular and inside the lipid bilayrs.
Which organ systems work together to provide oxygen to cells throughout the body?
respitory systym and circulatory system because you need your lungs to breathe and the blood and heart to pump the oxygen into the blood. :))
The two organ systems that work together to provide oxygen to cells throughout the body are the respiratory organ system and the circulatory organ system and both systems work together and circulate blood all over the body.
What is the significance of the respiratory and circulatory systems in the body?Both these respiratory and circulatory systems have high importance in the body, as the respiratory system is responsible for exchanging gases between the body and its surroundings, while the circulatory system is responsible for transporting oxygen, nutrients, and other substances throughout the body, and by doing so, they maintain body homeostasis.
Hence, the two organ systems that work together to provide oxygen to cells throughout the body are the respiratory organ system and the circulatory organ system and both systems work together and circulate blood all over the body.
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A bird with mutation that made its beak stronger so that it can now crack many different types of nuts would be considered which type of mutation
A. Lethal
B. Neutral
C. Advantageous
D. Deleterious
Which of the following best describes cells that are produced by meiosis
A. Gametes; Diploid
B. Body cells; haploid
C. Gametes;haploid
D. Body cells; diploid
A cell from the same organism have what in common
A. Shape
B. Size
C. Function
D. DNA
Which of the following occurs in meiosis that does not happen in mitosis
A. Chromosome duplication
B. Identical cells are formed
C. Crossing over
D. A cell wall is formed
A bird with mutation that made its beak stronger so that it can now crack many different types of nuts.
It is C. Advantageous mutation as it provides an advantage.
Cells that are produced by meiosis are best described as C. Gametes;haploid as they only have half the number of chromosomes.
A cell from the same organism have the same D. DNA.
By definition, C. Crossing over only occurs in meiosis that does not happen in mitosis.
I live in a house with no neighbors who do I go to when I am getting hurt in my home ?
are you ok? like seriously is your home life ok i dont want you to be going through anything you shouldnt.
Are you ok? Do you need someone to talk to? People reach out to anyone for help if this is serious.
Heterozygote advantage should be most closely linked to which of the following?
A) sexual selectionB) stabilizing selectionC) random selectionD) directional selectionE) disruptive selection
The correct answer is: B) stabilizing selection
Stabilizing selection is a type of natural selection in which the population mean (non-extreme trait value) is favored over extreme values. It favors the intermediate variants such as heterozygous phenotype (more than both homozygous). This is the most common type of selection, because most traits change little over time (not by favoring extreme traits).
Heterozygote advantage, a circumstance where heterozygous individuals have a higher fitness level than homozygous individuals, is most closely linked to stabilizing selection. This selection favors average phenotypes and works against extreme variations, thus reducing genetic diversity. Hence the correct answer is option B)stabilizing selection
Explanation:
The term Heterozygote Advantage refers to a circumstance in which heterozygous individuals (with two different alleles for a particular gene) have a higher fitness level than homozygous individuals (with two identical alleles). It's most closely linked to stabilizing selection (option B).
Stabilizing selection is a selective force that favors average phenotypes and works against extreme variations. In other words, it tends to reduce genetic diversity over time, which is why it is often associated with heterozygote advantage.
For example, with sickle cell anemia, individuals who are heterozygous for the sickle cell trait are less prone to malaria, giving them a higher survival rate in areas where the disease is prevalent. This is an example of heterozygote advantage and stabilizing selection at work.
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What is a universal way that predation benefits the predator?
Predation increases mate availability.
Predation helps in defense of space.
The predator gets the energy it needs to survive.
The predator keeps parasites from hurting the species.
The predator gets the energy it needs to survive.
Answer:Option C
Explanation: The predators are the animal (carnivores) that feed on the other smaller animals for their energy need. The animals they feed on provide energy for their survival.
The predators are generally carnivore animals that eat animals as their soul source of energy to perform the vital functions such as running, walking, eating and metabolism inside the body.
So, predation helps to gain energy from the prey for survival.
What soil particle size has the greatest oxygen holding capacity? What soil particle size has the greatest water holding capacity? (Site 1)
Clay
Explanation;The soil particle size that has the greatest oxygen holding capacity is the clay. Clay is a fine-grained natural rock or soil material that combines one or more clay minerals with traces of metal oxides and organic matter.Answer:
The correct answer is clay.
Explanation:
Clay is the soil particle that exhibits the greatest oxygen holding capacity. It is a fine-grained soil or natural rock substance, which combines one or more minerals of clay with the traces of organic matter and metal oxides. The maximum concentration of water, which a given soil can hold is known as its field capacity, and the clay refers to the soil that exhibits the greatest water holding tendency.
Upon arriving at a crime scene, your partner secures the area. You begin drawing what you see. This type of sketch are you likely creating?
First drawing
Rough sketch
Original scene
All of the above
Option b.
The type of sketch that you are likely creating upon arriving at a crime scene is a Rough sketch.
Explanation:A rough sketch is a preliminary drawing that provides an overview of the crime scene, including the location of evidence, the layout of the area, and any other relevant details. It is a quick and approximate representation of the scene and helps in documenting the initial observations.
In addition to the rough sketch, you may also create other types of sketches, such as detailed sketches, scaled sketches, or final sketches, depending on the specific requirements of the investigation.
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Changes in arterial pH can modify respiration rate and rhythm even when carbon dioxide and oxygen levels are normal.
True
False
The answer is false!
Answer: The answer is TRUE
Explanation:
At birth, gordy was found to have a severe thyroid deficiency and was put on thyroid hormone replacement to prevent an intellectual disability resulting from the condition known as
t birth, gordy was found to have a severe thyroid deficiency and was put on thyroid hormone replacement to prevent an intellectual disability resulting from the condition known as
Hypothroidism
Answer:
The correct answer is cretinism.
Explanation:
Cretinism also knew as congenital hypothyroidism refers to an extreme thyroid hormone deficiency in newborns. It leads to stunted growth, impaired neurological function, and physical deformities. The condition may take place because of an issue with the infant's thyroid gland, or due to the lack of iodine in the body of a mother at the time of pregnancy.
Which of the following is a correct statement about the endocrine system?
The adrenal glands sit on top of the kidneys and release insulin, which regulates blood sugar.
The adrenal glands sit on top of the kidneys and release TSH, which affects heart rate.
The adrenal glands sit on top of the kidneys and release adrenaline, which affects heart rate.
The adrenal glands are in the neck and release TSH, which affects heart rate.
The adrenal glands are in the neck and release adrenaline, which affects heart rate.
The adrenal glands sit on top of the kidneys and release adrenaline, which affects heart rate.
Explanation;Adrenal glands are located at the top of each kidney. They produce hormones that help the body control blood sugar, burn protein and fat, react to stressors like a major illness or injury, and regulate blood pressure. The Adrenal glands are made up of two regions; the adrenal cortex and the adrenal medulla. The adrenal medulla produces hormones adrenaline also epinephrine and noradrenaline also norepinephrine. Hormone adrenaline rapidly responds to stress by increasing your heart rate and rushing blood to the muscles and brain.Which of the following correctly describe veins?
Select all that apply.
major site of gas exchange with body tissues
depend on body movement to help move blood along
thin-walled
contain valves to prevent backflow
Answer:
depend on body movement to help move blood along
thin-walled
contain valves to prevent backflow
Explanation:
Veins return deoxygenated blood to the heart. They are thinly walled to allow blood plasma to flow back from tissues. This is after capillaries have brought in oxygenated and nourished blood into interstitial spaces from which exchanges with tissue occurs. The movement of this blood in the veins is assisted by musculoskeletal movements while the vein valves prevent backflow because the blood does not have as much pressure as in the arteries.
cell walls eukaryotic heterotrophic usually multicellular Which characteristic BEST indicates that the organism in question is a fungus, not a plant? A) cell walls B) eukaryotic C) heterotrophic D) usually multicellular
C.) heterotrophic, according to SoCratic
plz help me
Where in the diagram does oxygen first enter the bloodstream?
A. 2
B. 4
C. 3
D. 5
The correct answer is choice D.
Oxygen first enters the bloodstream in the lung capillaries. The oxygen rich blood then returns to the heart.
Answer:
The correct answer is option D. 5 (lung capillaries).
Explanation:
The oxygen first enters in lung capillaries into the bloodstream from the alveoli by the simple diffusion. There is a network of tiny vessels known as capillaries from the alveoli sacs of lungs.
Lung capillaries transport the oxygenated blood to the heart and from there it pumps to the different parts of the body where blood carries the carbon dioxide in veins to the heart.
Thus, the correct answer is option D. 5. (lung capillaries).
During pneumonia, the lungs become "waterlogged"; this means that within the alveoli there is an abnormal accumulation of ______.
interstitial fluid - hope this helps!!
During pneumonia, the lungs become "waterlogged," which means that within the alveoli there is an abnormal accumulation of fluid and the lungs become "waterlogged" due to this abnormal accumulation.
What is the significance of the pneumonia in the lungs?In pneumonia, the accumulation of fluid in the alveoli is referred to as "alveolar edema," and this can be caused by a variety of factors, including infection with bacteria or viruses, injury to the lungs, etc., and fluid has accumulated within the alveoli, making it difficult for gas exchange to occur, which causes respiratory distress.
Hence, during pneumonia, the lungs become "waterlogged," which means that within the alveoli there is an abnormal accumulation of fluid and the lungs become "waterlogged" due to this abnormal accumulation.
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Meiosis starts with a single diploid cell and produces
A. two haploid cells
B. two diploid cells
C. four haploid cells.
D. four diploid cells
E. eight haploid cells
Meiosis starts with a single diploid cell and produces C) four haploid cells.
Explanation:Meiosis starts with a single diploid cell, which contains two sets of chromosomes, and produces C) four haploid cells, each containing one set of chromosomes.
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The correct answer is option (C). Meiosis starts with a single diploid cell and produces four haploid cells.
Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells.
This process is essential for sexual reproduction in eukaryotic organisms, as it produces gametes (sperm and egg cells) that contain a single set of chromosomes.
Here is the step-by-step explanation of meiosis:
1. Meiosis begins with a single diploid cell (2n), which contains two sets of chromosomes, one from each parent.
2. The cell undergoes DNA replication, so that each chromosome consists of two identical sister chromatids.
3. The cell then enters meiosis I, which is divided into several stages:
Prophase I: Homologous chromosomes pair up in a process called synapsis, and crossing over occurs, which allows for genetic diversity.Metaphase I: Homologous pairs align at the metaphase plate.Anaphase I: Homologous chromosomes are pulled apart and move to opposite poles of the cell.Telophase I and Cytokinesis: The cell divides into two non-identical haploid cells (n), each with one set of chromosomes.4. Meiosis II follows, which is similar to mitosis and involves the separation of sister chromatids:
Prophase II: Chromosomes condense again.Metaphase II: Chromosomes align at the metaphase plate.Anaphase II: Sister chromatids are pulled apart.Telophase II and Cytokinesis: The cell divides into two haploid cells, resulting in a total of four haploid cells from the original diploid cell.Would a population with a lot of genetic variation or little genetic variation be more likely to have individuals that can adapt to a changing environment?
a population with a LOT of genetic variation
Name four types of cutaneous sensory receptors
Cutaneous receptors are:
• Pacinian corpuscles-These are types of mechanoreceptor (response to mechanical stimuli such as pressure or vibration). They are nerve endings in the skin that are sensitive to vibration and pressure
• Merkel's disc-These are types of mechanoreceptors, nerve endings that are sensitive to mechanical pressure, position, and sustained touch (shapes and edges of objects).
• Ruffini's end organ- These are types of mechanoreceptors slowly adapted that detects skin stretch.
• Meissner's corpuscles- These are types of mechanoreceptors, nerve endings responsible for sensitivity to light touch (changes in texture).
Four main types of cutaneous sensory receptors are free nerve endings, Merkel's disks Ruffini endings and Pacinian corpuscles. They respond to stimuli like pain, temperature, light touch, skin stretch joint activities and vibration respectively.
Explanation:The skin has a variety of specialized sensory receptors, each responding to specific types of stimuli. Four main types of these sensory receptors are: 1. Free nerve endings which are most common and sensitive to painful stimuli, hot and cold temperatures, and light touch. 2. Merkel's disks, found mainly in fingertips and lips, they respond to light touch. 3. Ruffini endings which detect skin stretch joint activity and warmth. 4. Pacinian corpuscles that detect transient pressure and high-frequency vibrations.
These touch-related stimuli receptors play a crucial role in our sense of touch, allowing us to interact with and understand our environment. For example if an insect crawls on your skin, the movement of hair follicles triggers the free nerve endings, alerting you of the presence of the insect.
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The energy released from which of the following biomolecules is the main source of energy that is stored as ADP is turned into ATP?
A. Carbohydrate
B. Lipid
C. Protein
D. Nucleic Acid
A. Carbohydrate
reason is because it is due to liquid
Name the phase of the cell cycle/Mitosis.
Thanks! ❤️
interphase,prophase,metaphase,anaphase,telophase
The diagram below shows the various stages of the cell cycle in onion root tip cells. MOST of the plant cells in this diagram are in which of the following stages of the cell cycle?
Question 2 options:
telophase
prophase
anaphase
interphase
I think the answer is b
Answer: Cell spends
Explanation:
High air pressure means that the air is (blank A.) and (blank B.).
Choices for (blank A).
1.lighter
2.higher
3.nearer
4.colder
Choices for (blank B.)
1.further
2.warmer
3.lighter
4.heavier
Answer:
Colder and Heavier
Explanation:
Air pressure is the ratio of force exerted by air per unit area ,measure in pascal , Newton per square meter, torricelli, atmosphere etc
High air pressure means that the air is (blank A.) and (blank B.).
Choices for (blank A).
1.lighter
2.higher
3.nearer
4.colder
Choices for (blank B.)
1.further
2.warmer
3.lighter
4.heavier
BLank A colder
blank B is heavier.
This is so because high air pressure is a colder air from the Earth's atmosphere down to the surface of the earth. It is denser than air that's why it is heavy. Because it is denser than normal air. it moves from the bottom layer of the atmosphere.
High air pressure means that the air is denser and heavier. It's important in weather forecasting as high pressure areas often mean clearer weather, while low pressure could indicate unsettled conditions.
Explanation:High air pressure indicates that the air is denser and heavier. Atmospheric pressure refers to the force exerted by the weight of the air in the atmosphere. In regions of high pressure, the air is denser because more air molecules are compressed into a certain space, compared to regions of low pressure. This denseness makes the air heavier. This principle is crucial for understanding weather forecasting, as areas of high pressure often correspond with clearer, sunnier weather, whereas low pressure areas could indicate stormy or unsettled weather conditions.
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Which of these functions is a responsibility of the muscular system?
A.
communication
B.
forming blood cells
C.
providing protection for the internal organs
D.
maintaining internal equilibrium
E.
storing essential minerals
Answer:
C. providing protection for the internal organs
Explanation:
The muscular system is made up of the muscles of the body. The main function the muscular system is that it aids movement. Muscles attached to bones and to one another helps the body during locomotion.
The muscular system also serve to protect the internal organs from damage. Some of the abdominal muscles where there are no bones protects the organs located in that part of the body.
Answer:
A. communication
Explanation:
Muscular system give us The muscles we need for speaking and writing are also skeletal muscles.