How many sodium ions are pumped out in response to two potassium ions transported into the membrane?
Correct answer: D. 3
- A. 4
- B. 1
- C. 2
- D. 3
Explanation
The sodium-potassium pump moves 3 Na+ out and 2 K+ in per cycle, maintaining the resting membrane potential (-70 mV) with more positive charge outside than inside.
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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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