Resting membrane potential of neurons is _, while during active membrane potential the inner membrane surface becomes more _ than the outside.
Correct answer: D. -70 mV ; positive
- A. +70 mV ; negative
- B. -70 mV ; negative
- C. +70 mV ; positive
- D. -70 mV ; positive
Explanation
During the resting state, the membrane potential arises because the membrane is predominantly permeable to K+. An action potential begins at the axon hillock as a result of depolarisation. During depolarisation, voltage-gated sodium ion channels open due to an electrical stimulus. During active membrane potential, the inner membrane surface becomes more positive than the outside.
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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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