Which one of the following sets of ions is necessary for the transmission of nerve impulses?
Correct answer: A. Na+ and K+
- A. Na+ and K+
- B. Ca2+ and Na+
- C. Ca2+ and K+
- D. Na+ and Mg2+
Explanation
Sodium (Na+) and potassium (K+) ions are essential for nerve impulse conduction. Their movement across the neuron's membrane generates action potentials, and the sodium-potassium pump restores the resting ionic balance.
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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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