PLEASE HELP! 20 POINTS! This is an Anatomy question.
At a myoneural junction, what is the function of the motor end plate?
To release neurotransmitters that travel toward the axon terminal
To bind neurotransmitters and generate an action potential in the sarcolemma
To release sodium and potassium that travel toward the axon terminal
To bind sodium and potassium and generate an action potential in the sarcolemma
Answers
Answer:
To bind neurotransmitters and generate an action potential in the sarcolemma
Explanation:
A Myoneural junction is also known as A neuromuscular junction that basically is a chemical synapse which is created when a motor neuron contacts a muscle fiber. This synapse made between a spinal motor neuron and skeletal muscle cell has a specific structure due to which it is called the motor endplate.
Now what is the function of this motor endplate?
We already know that in response to a stimuli a series of events start in nervous system which lead to the production of a response. For example, when we touch a hot object a signal travels through Central nervous system and the response occurs when we move our hands away from the hot object.
Now, taking this same example, what happens is that when a response has to be produced , for example muscle contraction, the neurons which act there are called motor neurons. When the motor nerve is stimulated due to arrival of a nerve impulse in the motor nerve terminals, the first response occurs with the help of motor endplate.
The arrival of motor neuron causes an action potential at presynaptic neuron terminal that opens up calcium channels and Ca2+ ions into the presynaptic neuron's cytosol causing several neurotransmitter molecules to fuse with the presynaptic neuron's cell membrane
Here, the neurotranmsitters like acetylcholine binds with the receptors present in the motor end plate. As soon as they bind with the receptors on motor end plate, an influx of Na+ ions occurs that triggers an action potential. When action potential is triggered it travels along the sarcolemma and into the muscle fiber which initiate the muscle contraction. This muscle contraction is the response to a certain stimuli and in the example we discussed it will be bringing our hand away from the hot object.
This is a long and complex mechanism which i tried to summarize, You can get a better idea by looking at the diagram attached.
Related Questions
Gene therapy is a way doctors can treat a disease by inserting a healthy gene into a patient's cells, instead of using drugs or surgery. The new version of the gene helps the patient's body fight the disease. Gene therapy is A) considered a very safe technique. B) still being researched and is not used on humans. C) still being tested and is used for diseases that have no cure. D) used frequently today to prevent many common childhood diseases.
Answers
The answer is; C
Gene therapy is still not considered safe and has not been approved for humans, especially due to errors in inserting of DNA at the target site and also random relapse of the DNA from its inserted site. Gene therapy, however, can be sanctioned when its benefits outweigh its risks such as in terminally ill patients - with the approval of the patient and local relevant policies/authorities. Gene therapy, today, is being tested with innovative tools called CRISPR/Cas9.
Answer: C) still being tested and is used for diseases that have no cure.
Explanation: It is considered as risky and is only used for diseases with no cures. It's not used for those diseases with many cures and it is not safe.
Skeletal muscle cells are usually attached to bone by
A. fascicles.
B. ligaments.
C. tendons.
D. flexors.
Answers
C. Tendons
Tendons are connective tissues that are able to attach muscles to bones. They are found through out the body especially at the end of each muscle. Including the human eyeball where tendons are used to connect muscles to other parts.
• Fascicles are fibers which cannot be attach skeletal muscles to the bone.
• Ligaments are connective tissues which connect bones to joints.
• Flexors are muscles that are able to stretch a body part.
Skeletal muscle cells are attached to bones by tendons, which are tough connective tissues that enable the movement of bones at joints when muscles contract.
Explanation:Skeletal muscle cells are usually attached to bone by tendons. Tendons are tough connective tissues that connect skeletal muscles to the skeleton, allowing for the movement of bones at a joint. When muscles contract, the tension is transmitted through these tendons which in turn pull on the bones, facilitating movement.
Tendons are composed of dense, regular connective tissue and are integral for the interaction of skeletal muscles in the body. This connection to bones is crucial for muscles to perform functions like maintaining posture, stabilizing bones and joints, controlling internal movement, and generating heat.
Earth's initial atmosphere probably contained higher levels of water vapor than today's atmosphere. Most of the water vapor left the atmosphere due to the _____ of Earth.
A. cooling
B. rotation
C. warming
D. revolution
Answers
The best answer i see is A)- Cooling
i hope this is right and it helps you
Answer:
Earth's initial atmosphere probably contained higher levels of water vapor than today's atmosphere. Most of the water vapor left the atmosphere due to the a) cooling of the earth.
Explanation:
To understand this answer we need to understand the characteristics of cold and hot air. First of all, hot air or in this case water vapor due to physics tends to go up, while cold air or vapor tends to go down. This can be observed in the process of raining. Vapor always goes up and comes down to earth in the form of water, mist or snow. However, in that time the vapor didn't come down and kept going up because the atmosphere was not developed and the earth's cooling was responsible for that. Because it didn't have the pressure and gravity it has today.