In the sliding filament mechanism of muscle contraction, the proteins that inhibit contraction are:
A)actin and troponin
B)myoglobin and myosin
C)troponin and tropomyosin
D)troponin and myosin

Question

Quizplus · Accepted Answer

Troponin and tropomyosin are the proteins that inhibit muscle contraction by blocking the active sites on the actin filament. When calcium ions are released, they bind to troponin, causing a conformational change that moves tropomyosin and exposes the active sites for myosin to bind, allowing for muscle contraction to occur.

In the Sliding Filament Mechanism of Muscle Contraction, the Proteins