Assertion: The mechanism of muscle contraction is largely influenced by calcium ions.

Reason: Calcium ions act as cofactor of myosin ATPase enzyme, hydrolysing ATP into ADP and Pi, thereby utilising energy

which is true and why??? experts plz explain...

Both assertion and reason are true.
Muscle contraction depends highly on Ca ions because when  the depolarization of muscle fibre occurs it opens the volatge dependent calcium channel to give access to calcium ions. This process triggers the process of muscle contraction. These calcium ions act as cofactor and extract the energy from the ATP.

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