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Question
Long answer question
Answer the question after observing the diagram given below.
What should be the reason for the next impulse to be conducted?
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Solution
a. When a neuron receives an impulse, it passes it to the next neuron. The impulse travels along the axon of the pre-synaptic neuron to the axon terminal.
b. Pre-synaptic neurons or axons have synaptic knobs at their ends or terminals. These synaptic knobs have synaptic vesicles that contain neurotransmitter molecules.
c. When the impulse reaches a synaptic knob, Ca+ channels open and Ca+ ions diffuse inward from the extracellular fluid.
d. This causes the release of neurotransmitters that bind to the receptors of the post synaptic cell.
e. The neurotransmitter is destroyed by the enzyme cholinesterase. A new impulse/ next impulse is generated and conducted to the synaptic gap.
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