PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a contracting muscle, the ____ come closer together.
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I band
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A band
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M line
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Z disc
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Explanation:
Detailed explanation-1: -Figure 6.7. When (a) a sarcomere (b) contracts, the Z lines move closer together and the I band gets smaller. The A band stays the same width and, at full contraction, the thin filaments overlap.
Detailed explanation-2: -The movement of the actin filaments also pulls the Z lines closer together, thus shortening the sarcomere.
Detailed explanation-3: -The Z-band in vertebrate striated muscle crosslinks actin filaments of opposite polarity from adjoining sarcomeres and transmits tension along myofibrils during muscular contraction.
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