Ip2-worksheet-neuromuscular-junction PDF

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Teacher : Annette
It was a an in class activity that required the students to watch videos and answer questions....

Description

Muscular System: The Neuromuscular Junction

1.

Synaptic vesicles in the axon terminal of a motor neuron contain what neurotransmitter?

acetylcholine

2.

By what means of membrane transport does the neurotransmitter leave the axon terminal? exocytosis

3.

What ion diffuses into the axon terminal to stimulate the release of acetylcholine? calcium

4.

In order to contract, a muscle fiber must be stimulated by what type of cell from the nervous system?

MOTOR NEURON

5.

What is the name for the specialized region of the muscle fiber that contains acetylcholine receptors?

ACh receptors

6.

What is the synapse between a motor neuron and a skeletal muscle fiber called?

Neuromuscular junction

7.

What ion diffuses through chemically-gated channels of the junctional folds to alter the membrane potential? Sodium channels

8.

What happens to chemically-gated channels when acetylcholine binds to them?

Open and allows sodium to diffuse in

9.

What happens to chemically-gated channels when acetylcholine is removed from the synaptic cleft? Ion channel closes and sodium can no longer come into

10.

What enzyme terminates the signal at the neuromuscular junction? acetylcholinesterase...