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Q.

Which of the following is not a characteristic of muscle contraction?

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a

The I-bands and H-zone of a sarcomere shorten during contraction.

b

Calcium ions are required for unmasking the active sites for myosin.

c

Repeated contraction can result in accumulation of lactic acid.

d

Troponin subunits present in the thick filament bind to calcium ions.

answer is D.

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Detailed Solution

Increase in Ca++ level leads to the binding of calcium with a subunit of troponin of thin filaments and thereby remove the masking of active sites for myosin.
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