PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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During muscle contraction, Z-lines of the sarcomere unit are
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pulled outwards thereby increasing the length of sarcomere
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compressed perpendicularly thereby decreasing height of sarcomere
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elongate perpendicularly thereby increasing height of sarcomere
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pulled inwards thereby causing shortening of sarcomere
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Explanation:
Detailed explanation-1: -As the Z lines come closer together, the sarcomere shortens. So, the sarcomere, the I band, and the H zone decrease in length during muscle contraction. 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-2: -Muscle contraction results in both the H-band and I-bands shortening, but the A-band remains the same length (A band is Always the same). The Z-band is a static structure and doesn’t change size.
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