PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A depolarization of charge in the sarcolemma begins the propagation of an action potential down the length of the sarcolemma as a result of ____
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Potassium ions diffusing into the cell
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Sodium ions diffusion into the cell
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Potassium ions diffusing out of the cell
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Sodium ions diffusion out of the cell
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Explanation:
Detailed explanation-1: -Sodium ions enter the muscle fiber further depolarizing the membrane, and an action potential rapidly spreads (or “fires”) along the entire membrane to initiate excitation-contraction coupling.
Detailed explanation-2: -Sodium ions diffuse outward along favorable chemical and electrical gradients. The inside surface of the sarcolemma is negatively charged compared to the outside surface. Sodium ions diffuse inward along favorable chemical and electrical gradients.
There is 1 question to complete.