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.