Answer:
ATP (Adenosin
Triphosphate) is the source of energy for muscle contraction. The head of each
myosin molecule contains an enzyme called myosin ATPase.
In the presence of
this enzyme along with 
then,
and 
ions the ATP
molecule breaks down into ADP and inorganic phosphate, thus releasing energy in
the head of myosin.
ATP 
ADP + P1
+ Energy Energy from ATP causes energised myosin to cross bridges and to bind
with actin and in this way initiates muscle contraction.
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