For the impulse to transfer from the presynaptic to the postsynaptic neuron, the substance required is:
Correct answer: D. Calcium
- A. Sodium
- B. Potassium
- C. Protein
- D. Calcium
Explanation
Calcium (Ca2+) is a vital element in the process of neurotransmitter release: when Ca2+ channels are blocked, neurotransmitter release is inhibited. When the action potential reaches the nerve terminal, voltage-dependent Ca2+ channels open and Ca2+ rushes into the neuron terminal due to a greater extracellular concentration.
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About Neurons and Nerve Impulse
Neurons receive and transmit information through dendrites, the cell body and axons. The topic explains resting potential, depolarization, repolarization, refractory periods and saltatory conduction, followed by synaptic transmission through neurotransmitters. An action potential is distinct from the graded potential produced at a receptor.
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