Question

During the contraction of muscle the ATP molecules bind with the active site of
a) myosin filament
b) myofibrils
c) nerve endings
d) actin filaments

Answer 1

For muscle contractions ATP is critical because it can break the myosin-actin cross bridge and free the myosin for the next contraction.

Thus, it first gets attached to ‘Myosin filament’ and moves at a very high state.

The ATP then gets hydrolyzed and forms ADP and inorganic phosphate with the help of enzyme ATPase. The energy that is released during the hydrolysis changes the angle and position of ‘myosin

Answer 2

Answer:

This action requires energy, which is provided by ATP. Myosin binds to actin at a binding site on the globular actin protein. Myosin has another binding site for ATP at which enzymatic activity hydrolyzes ATP to ADP, releasing an inorganic phosphate molecule and energy.