The Physical Effects of a Muscle Twitch Last Longer Than

question 9

Multiple Choice

The physical effects of a muscle twitch last longer than the action potential that triggered the contraction because

• A) muscle fibers lack elasticity.
• B) it takes time to extrude calcium ions out of the fiber.
• C) the acetylcholine molecules are slowly cleared from the neuromuscular junction.
• D) the twitches run back and forth along the muscle fiber.
• E) muscle fibers are thicker than axons.

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