Which of the following must be true about the structures of axons and muscle cells in order for nerve impulses to stimulate muscle contraction?
a- Axons and muscle cells must both have structures that make and secrete the same small molecules.
b- axons and muscle cells must both have receptors that recognize the same small molecules.
c- Axons must have structures that make and secrete molecules, and muscle cells must have receptors that recognize these molecules.
d-Muscle cells must have structures that make and secrete molecules, and axons must have receptors that recognize these molecules.
B?
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Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
See your last post.
Really people, just answer the question!
answer it plz
I'm guessing it's B
I am pretty sure it is B..
That answer makes the most sense to me!
BUT
I wish they would have just given the answer! I really need help on this test
To determine the correct answer, let's break down the options and consider the relationship between axons and muscle cells in the context of nerve impulses and muscle contraction.
a- Axons and muscle cells must both have structures that make and secrete the same small molecules.
This option suggests that both axons and muscle cells need to produce and release the same molecules in order for nerve impulses to stimulate muscle contraction. However, this is not the case, as the molecules involved in muscle contraction, such as neurotransmitters like acetylcholine, are primarily produced and released by axons, not muscle cells. Thus, this option is not true.
b- Axons and muscle cells must both have receptors that recognize the same small molecules.
This option implies that both axons and muscle cells should possess receptors that can recognize the same molecules. This is indeed true because nerve impulses travel along axons and are transmitted to muscle cells at the neuromuscular junction. At this junction, the axon releases neurotransmitters, like acetylcholine, which bind to specific receptors on muscle cells, initiating muscle contraction. So, option B is correct.
c- Axons must have structures that make and secrete molecules, and muscle cells must have receptors that recognize these molecules.
This option combines elements from both options A and B. While it acknowledges the role of axons in producing molecules, it does not recognize that muscle cells do not produce these molecules. Therefore, option C is not true.
d- Muscle cells must have structures that make and secrete molecules, and axons must have receptors that recognize these molecules.
This option reverses the roles defined in option C, suggesting that muscle cells produce molecules and axons possess receptors. However, this is not accurate, as muscle cells do not produce the molecules necessary for nerve impulses to stimulate muscle contraction. Thus, option D is also not true.
In conclusion, the correct answer is option B, which states that axons and muscle cells must both have receptors that recognize the same small molecules.