PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Z lines move closer together when the muscle contracts
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True
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False
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Either A or B
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None of the above
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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: -The primary function of the Z-band is the transmission of tension from one sarcomere to the next. As actin filaments are not continuous through the Z-band, the tension has to be transmitted through the Z-band assembly; hence, understanding the 3D structure is important.
Detailed explanation-3: -So, the correct answer is ‘A-Band remains constant’.
There is 1 question to complete.