What is a sarcomere?

  • A
    The region between two $H$-lines
  • B
    The region between two $A$-lines
  • C
    The region between two $I$-bands
  • D
    The region between two $Z$-lines

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The functional unit of the contractile system in the striped muscle is

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$M-$line passes through the centre of

The actin filament is shown below. Where does $Ca^{++}$ bind during muscle contraction?

Cardiac muscle fibres are

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