PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The centers of the I bands
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The H Band
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M line
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Z lines
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Zone of overlap
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Explanation:
Detailed explanation-1: -The vertical lines within the I band, one of which has been labeled here with the letter W, represent a region called the Z line. The Z lines usually appear slightly darker in micrographs as there are other protein filaments present here in addition to actin. Two successive Z lines mark the boundary of each sarcomere.
Detailed explanation-2: -In the centre of each ‘I’ band is an elastic fibre called ‘Z’ line which bisects it. The thin filaments are firmly attached to the ‘Z’ line.
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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