Biology · Muscle Physiology

Identify the correct statements regarding Fast-Twitch muscle fibers: I. Diameter is about twice that of slow-twitch fibers. II. Higher myoglobin and mitochondria concentration. III. 2–3 times more phosphagen system enzymes. IV. Sprinters often have ~65% fast-twitch fibers.

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1I, II, and III only
2II, III, and IV only
3I, III, and IV only✓
4I, II, and IV only

Correct answer

I, III, and IV only

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Identify the correct statements regarding Fast-Twitch muscle fibers: I. Diameter is about twice that of slow-twitch fibers. II. Higher myoglobin and mitochondria concentration. III. 2–3 times more phosphagen system enzymes. IV. Sprinters often have ~65% fast-twitch fibers.

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Identify the correct statements regarding Fast-Twitch muscle fibers: I. Diameter is about twice that of slow-twitch fibers. II. Higher myoglobin and mitochondria concentration. III. 2–3 times more phosphagen system enzymes. IV. Sprinters often have ~65% fast-twitch fibers.

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