In the following diagram of action potential in a neuron, 'x' depicts:
Correct answer: A. Depolarization
- A. Depolarization
- B. Polarization
- C. Repolarization
- D. Hyperpolarization
Explanation
Depolarization refers to the phase of an action potential where the membrane potential of a neuron becomes less negative or more positive. It typically occurs after the initial stimulus triggers a rapid influx of sodium ions into the cell, causing a change in the membrane potential. In the given diagram, 'x' represents depolarization.
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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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