Which of the following ions are involved in the initiation of nerve impulse_______________?
Correct answer: A. Na+
- A. Na+
- B. K+
- C. Fe
- D. none of these
Explanation
Sodium ions initiate a nerve impulse when voltage-gated sodium channels open and Na+ enters the neuron, causing rapid depolarization of the membrane. Students may choose potassium because K+ is important in repolarization, but it does not initiate the action potential.
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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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