Which type of contraction results in no change in muscle length?

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Study for the Advanced Subsidiary WJEC Physical Education Test. Engage with flashcards and multiple-choice questions, each providing hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

Which type of contraction results in no change in muscle length?

Explanation:
The key idea is that some muscle contractions produce movement while others don’t. An isometric contraction happens when a muscle tenses and generates force but does not change length, so the joint angle stays the same. This is seen when you hold a weight steady or push against an immovable object—the muscle is active, but there’s no shortening or lengthening. In contrast, other types involve a change in length. Isotonic contractions produce movement; a concentric contraction shortens the muscle, while an eccentric contraction lengthens it as it controls or resists motion.

The key idea is that some muscle contractions produce movement while others don’t. An isometric contraction happens when a muscle tenses and generates force but does not change length, so the joint angle stays the same. This is seen when you hold a weight steady or push against an immovable object—the muscle is active, but there’s no shortening or lengthening.

In contrast, other types involve a change in length. Isotonic contractions produce movement; a concentric contraction shortens the muscle, while an eccentric contraction lengthens it as it controls or resists motion.

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