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Title: At the molecular level of skeletal muscle contraction, _ acts to expose myosin-binding sites on actin molecule? Post by: Smntnl on Oct 14, 2012 A) K
B) Na C) P D) Ca Title: At the molecular level of skeletal muscle contraction, _ acts to expose myosin-binding sites on actin molecule? Post by: onemustfall! on Oct 14, 2012 D) Ca
The tropomyosin molecule blocks the active sites of the actin. Troponin is a molecule that is bound to the tropomyosin. Troponin needs CA+ (calcium ions) to bind to it in order to rotate the tropomyosin molecule and expose the actin molecules for the myosin heads to interact for muscle contraction. Title: At the molecular level of skeletal muscle contraction, _ acts to expose myosin-binding sites on actin molecule? Post by: onemustfall! on Oct 14, 2012 Actin is a polymer (chain of linked molecules) that is wrapped by tropomyosin. The tropomyosin blocks the myosin-binding site by when Calcium ions bind it causes a change in protein configurations that exposes the myosin-binding site so the myosin head can bind.
Title: At the molecular level of skeletal muscle contraction, _ acts to expose myosin-binding sites on actin molecule? Post by: bugbugs4 on Oct 14, 2012 The answer is D.
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