The resting membrane potential is determined by which of the following?
Correct answer: A. Potassium ion gradient
- A. Potassium ion gradient
- B. Sodium ion gradient
- C. Bicarbonate ion gradient
- D. None of these
Explanation
Option A is correct since the typical resting membrane potential of a cell arises from the separation of potassium ions (intracellular, relatively immobile anions across the membrane of the cell. Option B is incorrect since the resting potential membrane is also determined by sodium ion concentration across the membrane, but potassium ion concentration is more important. Option C is incorrect since the intracellular bicarbonate regulates the action potential. Option D is incorrect since it states none of these, which is not the case.
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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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