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BIOLOGY
Asked by Audrey

What happens to the actin and myosin filaments when a muscle contracts?

● note: at the start of contraction ca+ binds to troponin which cause tropomyosin to move. This this binding sites on action are accessible. ➔ When a bound ATP on the myosin head is ​hydrolyzed to ADP and ino​rganic phosphate, the ​myosin head extends to attach​ to binding site on actin forming cross bridge ➔ Triggers power stroke ➔ A​ctin pulled towards M line ➔ Atp and pi released during power stroke ➔ Myosin remains attached to actin until... ➔ NEW atp attaches to myosin head ➔ This frees the head to either carry on with more contraction or to allow muscle to relax Therefore actin and myosin filaments slide over each other. They don’t actually become shorter them selves.

Sadaf Syeda
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