What is the approximate value of the active membrane potential?
Correct answer: C. 0.05V
- A. 0.17V
- B. -50 mV
- C. 0.05V
- D. Both A and B
Explanation
The correct answer is 0.05 V, which is equivalent to 50 mV. This value represents the peak of the action potential where the membrane briefly becomes positively charged inside relative to the outside. Option A (0.17 V) is too high and not within the typical range for membrane potentials. Option B (-50 mV) is a common value for the resting membrane potential, not during the action potential. Option D is incorrect because neither 0.17 V nor -50 mV correspond to the active membrane potential, which is best represented by 0.05 V.
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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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