Answered

  1. Which of the following conditions alters the magnitude of response of a single
    muscle fiber? (a) Internal cellular temperature (b) Internal cellular pH (c) Initial length
    of the fiber (d) Strength of the stimuli (e) Metabolic activity of the muscle fiber

Verified Answer :

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Final answer:

Factors such as fiber type, initial length of the fiber, and strength of stimuli influence the response of a single muscle fiber.


Explanation:

Fiber type, the initial length of the fiber at rest, and the strength of the stimuli are factors that can alter the magnitude of response of a single muscle fiber. For example, the type of muscle fiber (fast-twitch or slow-twitch) can affect its responsiveness to stimuli, the length of the fiber before contraction can impact its ability to generate force, and the intensity of the stimulus can determine the extent of the muscle fiber's contraction.


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The correct answer is (c) Initial length of the fiber.

Explanation:
The initial length of a muscle fiber, also known as its resting length, significantly affects the magnitude of response to stimuli. This phenomenon is explained by the length-tension relationship of muscle fibers. When a muscle fiber is stretched to its optimal length, it generates maximum force during contraction. However, if the fiber is stretched beyond or shortened from its optimal length, the force generation decreases. Therefore, the initial length of the muscle fiber directly influences its ability to generate force in response to stimuli.

While factors like internal cellular temperature, pH, strength of stimuli, and metabolic activity can also influence muscle function, they do not directly alter the magnitude of response of a single muscle fiber as significantly as its initial length does.

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