Excitation stops

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Daisy

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1)What happens when the muscle stops being stimulated?
calcium ions leave their binding sites and are moved by active transport back into the sarcoplasmic reticulum (this requires ATP)\
2) What does this cause?
The tropomyosin molecules to move back, so they block the actin-myosin binding sites again
3- Why are muscles not contracted?
because no myosin heads are attached to actin filaments
(so there are no actin-myosin cross bridges)
4) what happens?
the actin filaments slide back to their relaxed position, which lengthens the sarcomere

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Excitation stops

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