Diffusion of _ across the post synaptic membrane causes it to depolarize:
Correct answer: D. Sodium ions
- A. Calcium ions
- B. Chloride ions
- C. Potassium ions
- D. Sodium ions
Explanation
Diffusion of sodium ions (Na⁺) across the postsynaptic membrane causes it to depolarize. When an excitatory neurotransmitter binds to a receptor, it opens ion channels, allowing positively charged ions like sodium ions to rush into the cell. This influx of positive charge makes the inside of the cell less negative, which is known as depolarization and can lead to an action potential.
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About Coordination and Control
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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