PHYSIOLOGY
EXCITATION CONTRACTION COUPLING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Actin, a contractile protein, is a ____
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sarcolemma
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sarcoplasmic reticulum
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thick filament
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thin filament
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Explanation:
Detailed explanation-1: -The major protein components of smooth muscle thin filaments are actin, tropomyosin and caldesmon, present in molar ratios of 28:4:1 respectively. Other smooth muscle proteins which may be associated with the thin filaments in the cell are filamin, vinculin, alpha-actinin, myosin light chain kinase and calmodulin.
Detailed explanation-2: -Although actin is a prominent contractile protein, the significance of the expression of its various isoforms during development remains unclear. Myosin is the most abundant contractile protein and consists of two heavy and four light chains.
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