Depolarization during conduction of nerve impulse is due to:
Correct answer: A. Inward movement of Na+
- A. Inward movement of Na+
- B. Inward movement of K+
- C. Outward movement of K+
- D. Outward movement of Na+
Explanation
The inward movement of Na+ (sodium ions) occurs during the depolarization phase of a nerve impulse. When a neuron is stimulated, voltage-gated sodium channels open, allowing Na+ to rush into the cell. This influx of positively charged sodium ions causes the inside of the neuron to become less negative (or more positive), leading to the generation of an action potential. This rapid change in membrane potential is what propagates the nerve impulse along the axon.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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