PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A skeletal muscle twitch differs from a tetanic contraction in that ____
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the tetanic contraction is considered abnormal, while the twitch is a normal muscle response
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the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli
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the muscle twitch is prolonged and continuous while a tetanic contraction is brief and “jerky”
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the muscle twitch is a brief and “jerky” movement, while the tetanic contraction is prolonged and continuous
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Explanation:
Detailed explanation-1: -The force of a tetanic contraction is greater than that of a twitch contraction because: a) More acetylcholine is released at the neuromuscular junction per nerve impulse.
Detailed explanation-2: -14 Distinguish between a twitch and a sustained contraction. A twitch is the contractile response of a single muscle fiber to a single stimulus from a motor neuron. A sustained contraction involves many motor neurons, and thus many units.
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