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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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Smntnl Smntnl
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11 years ago
A) K
B) Na
C) P
D) Ca
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#1
11 years ago
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.
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#2
11 years ago
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.
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#3
11 years ago
The answer is D.
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