Which of the following is a true statement about a muscle's response to immobilization?
A)When a muscle is immobilized for a period of time, atrophy occurs more rapidly and extensively in fast-twitch fibers than in slow-twitch fibers.
B)As the immobilized muscle atrophies, an increase in fibrous and fatty tissue in the muscle occurs.
C)Atrophy of an immobilized muscle will begin after the first 30 days of inactivity, resulting in contractile weakness.
D)A muscle immobilized in a shortened position will have an increased ability to produce maximum tension at its resting length because of sarcomere absorption.

Question

Quizplus · Accepted Answer

When a muscle is immobilized for an extended period of time, it will undergo atrophy, which involves a loss of muscle mass and strength. During this process, there is an increase in fibrous and fatty tissue within the muscle, which can further inhibit muscle function. Atrophy affects both slow-twitch and fast-twitch fibers, although fast-twitch fibers may experience more rapid and extensive deterioration. The onset of atrophy typically begins within the first few days of immobilization and progresses over time, resulting in contractile weakness. However, a muscle that is immobilized in a shortened position may actually experience a decrease in the ability to produce maximum tension at its resting length due to sarcomere loss, rather than absorption.

Which of the Following Is a True Statement About a Muscle's