What would be a consequence of a person having Na+ levels in the blood and interstitial fluids that are well below normal?
A) Neurons would all be depolarized.
B) Neurons would not be able to undergo normal action potentials.
C) Action potentials would occur with greater frequency.
D) Neurons would remain refractory following closure of voltage-gated sodium channels.
E) K+ channels would open to compensate for changes in membrane potential.

Question

Quizplus · Accepted Answer

Sodium ions are essential for the generation of action potentials in neurons. If there is a deficiency of Na+ ions in the blood and interstitial fluids, neurons would not be able to generate and propagate action potentials normally, leading to impaired neuronal function. Choice A is incorrect because low levels of Na+ would actually cause hyperpolarization of neurons, making it harder for them to reach the threshold for firing an action potential. Choice C is incorrect because lower Na+ levels would actually decrease the frequency of action potentials. Choice D is incorrect because the refractory period is related to the inactivation of voltage-gated sodium channels, not the availability of Na+ ions. Choice E is not a direct consequence of low Na+ levels and is not supported by the given information.

What Would Be a Consequence of a Person Having Na