Question

use the word bank on the next page to answer the following questions. 35. what is this a diagram of? neuromuscular junction 36. what do the arrows labeled a represent? acetylcholine 37. what part of the neuron in d? axon terminal (button) 38. what is substance b? acetylcholine 39. name the passage b is moving through synaptic cleft 40. what is structure c? 41. what does structure c contain? 42. what triggered structure c to do i? ca2+

Explanation:

1. The diagram shows the structure where a neuron meets a muscle cell, which is a neuromuscular junction.
2. In a neuromuscular junction, acetylcholine is the neurotransmitter released, which is what the arrows labeled A represent.
3. D is the end - part of the neuron that releases neurotransmitters, known as the axon terminal (button).
4. As in 36, substance B is also acetylcholine, the key neurotransmitter in this junction.
5. The space between the neuron and the muscle cell where neurotransmitters travel is the synaptic cleft.
6. Structure C appears to be synaptic vesicles which store neurotransmitters.
7. Synaptic vesicles (structure C) contain neurotransmitters (acetylcholine in this case).
8. Calcium ions ($Ca^{2 +}$) trigger the release of neurotransmitters from synaptic vesicles.

Answer:

1. Neuromuscular Junction
2. Acetylcholine
3. Axon terminal (button)
4. Acetylcholine
5. Synaptic cleft
6. Synaptic vesicles
7. Neurotransmitters (acetylcholine)
8. $Ca^{2 +}$