An action potential from a motor neuron leads to which of the following, at the
ID: 3482709 • Letter: A
Question
An action potential from a motor neuron leads to which of the following, at the site of its synapse with a muscle fiber?a. the opening of voltage-sensitive calcium channels in the nerve terminus b. the opening of voltage-sensitive potassium channels in the sarcoplasmic reticulum of the neuron. c. fusion of vesicles filled with Acetylcholine with the membrane of the neuron at the site of the synaptic cleft. d. a and c e. b and c An action potential from a motor neuron leads to which of the following, at the site of its synapse with a muscle fiber?
a. the opening of voltage-sensitive calcium channels in the nerve terminus b. the opening of voltage-sensitive potassium channels in the sarcoplasmic reticulum of the neuron. c. fusion of vesicles filled with Acetylcholine with the membrane of the neuron at the site of the synaptic cleft. d. a and c e. b and c An action potential from a motor neuron leads to which of the following, at the site of its synapse with a muscle fiber?
a. the opening of voltage-sensitive calcium channels in the nerve terminus b. the opening of voltage-sensitive potassium channels in the sarcoplasmic reticulum of the neuron. c. fusion of vesicles filled with Acetylcholine with the membrane of the neuron at the site of the synaptic cleft. d. a and c e. b and c
Explanation / Answer
When action potential spread over the nerve terminal voltagevgated calcium channel opens and allow calcium ion to diffuse from the synptic space ti the interiorof nerve terminal .calcium ion are believed to exert attractive influence on the acetylcholine vesicles drawing them to neural membranes adjacent to dense bar.
The vesicke then fuse with the neural membrane and empty their acetylcholine into the synaptic space by the process of exocytosis.
So option (D).
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