The actin filament is shown below. Where does | vedclass

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Question

(A) In the given diagram of the actin filament:$P$ represents the troponin complex.$Q$ represents the tropomyosin filament.$R$ represents the $F$-acti

Vedclass · Accepted Answer

$P$

Vedclass · Answer

(A) In the given diagram of the actin filament:$P$ represents the troponin complex.$Q$ represents the tropomyosin filament.$R$ represents the $F$-actin (filamentous actin) strand.During muscle contraction,$Ca^{++}$ ions bind to the troponin complex $(P)$,which causes a conformational change in the troponin-tropomyosin complex,thereby exposing the active binding sites on the actin filaments for the myosin heads to attach. Therefore,the correct answer is $P$.

The actin filament is shown below. Where does $Ca^{++}$ bind during muscle contraction?

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