The diagram shows a synapse between two neurones. What is the role of the neurotransmitter molecules at X?

[Diagram shows vesicles releasing molecules into synaptic gap]

A. to carry the impulse across the synaptic gap
B. to generate an electrical impulse in the axon
C. to break down enzymes in the synaptic cleft
D. to store energy for the nerve impulse

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Question

The diagram shows a synapse between two neurones. What is the role of the neurotransmitter molecules at X?

[Diagram shows vesicles releasing molecules into synaptic gap]

A. to carry the impulse across the synaptic gap
B. to generate an electrical impulse in the axon
C. to break down enzymes in the synaptic cleft
D. to store energy for the nerve impulse

Accepted Answer

to carry the impulse across the synaptic gap — Award 1 mark for recognizing that neurotransmitters diffuse across the synaptic cleft and bind to receptors on the next neurone, transmitting the signal chemically. B is incorrect — electrical impulses travel along neurones, not across synapses. C is incorrect — enzymes break down neurotransmitters, not the reverse. D is incorrect — neurotransmitters transmit signals, not store energy.

Answer

to store energy for the nerve impulse

Answer

to carry the impulse across the synaptic gap

Answer

to generate an electrical impulse in the axon

Answer

to break down enzymes in the synaptic cleft

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