36
QuizMultiple Choice

Body Image and Eating Disorders — Cumulative exam

Question 36 • SVLC LIFETIME FITNESS A (15500)

Read the scenario.Curtis joined the school's track team and was excited for his first 400-meter dash. He trained for short bursts of speed, focusing on powerful takeoffs and rapid acceleration. During the race, he exerted a high level of force, sprinting as fast as he could. However, he noticed that his muscles began to tire quickly after each burst of speed.Which type of muscle fibers did Curtis mainly use during the 400-meter dash?

Answer
A
sarcomeres
B
fast-twitch fibers
C
myofibrils
D
slow-twitch fibers

Explanation

Curtis relied on powerful takeoffs, rapid acceleration, and short bursts of high-intensity effort. Fast-twitch fibers produce strong, rapid contractions suited to sprinting, but they fatigue quickly. Slow-twitch fibers are better suited to sustained activity, while sarcomeres and myofibrils are muscle structures rather than fiber types.

AI-written and checked against the verified answer.

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