PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which one of the following is a key characteristic of Fast Twitch B muscle fibers?
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They are Red in color, meaning they contain a lot of mitochondria
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They contract rapidly with great force but fatigue fast (as they use creatine phosphate pathway)
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They are recruited for long duration activities
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They contain high numbers of Mitochondria
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Explanation:
Detailed explanation-1: -Fast-twitch muscle fibers provide bigger and more powerful forces, but for shorter durations and fatigue quickly. They are more anaerobic with less blood supply, hence they are sometimes referred to as white fibers or type II.
Detailed explanation-2: -Fast fibres hydrolyse ATP approximately twice as quickly as slow fibres, resulting in much quicker cross-bridge cycling, which pulls the thin filaments toward the center of the sarcomeres at a faster rate.
Detailed explanation-3: -What are fast twitch muscles? Fast twitch muscles support short, quick bursts of energy, such as sprinting or powerlifting. You can see how they’re meant to function when you compare their design and structure to slow twitch muscles.
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