In an action potential, the permeability of sodium ions in the neurons increases due to:
Correct answer: C. The opening of sodium channels/gates
- A. Repolarization
- B. Sodium ions forming ionic bonding
- C. The opening of sodium channels/gates
- D. The action of the acetylcholinesterase enzyme
Explanation
Voltage-gated Na channels open during depolarization. allowing sodium ions to flow into the neuron. This influx of positive ions makes the inside of the cell less negative and triggers the action potential.
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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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