PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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increases
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stays the same
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decreases
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None of the above
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Detailed explanation-1: -The A band does not shorten-it remains the same length-but A bands of different sarcomeres move closer together during contraction, eventually disappearing.
Detailed explanation-2: -However, the A band does not change length during muscle contraction, since its length is the same as the length of the thick filaments.
Detailed explanation-3: -Upon muscle contraction, the A-bands do not change their length, whereas the I-bands and the H-zone shorten.
Detailed explanation-4: -Together, these two filaments form myofibrils which are important organelles in the skeletal muscle system. Muscle contraction can also be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same.