In the sliding filament mechanism of muscle contraction, the proteins that slide past each other as the muscle fiber shortens are:
A)myoglobin and myosin
B)actin and myosin
C)actin and troponin
D)troponin and tropomyosin

Question

Quizplus · Accepted Answer

The sliding filament mechanism of muscle contraction involves the interaction between actin and myosin protein filaments. As myosin heads bind to and walk along the actin filaments, they slide past each other, causing the muscle fiber to shorten. The other proteins listed (myoglobin, troponin, and tropomyosin) play important roles in muscle function, but they do not directly participate in the sliding filament mechanism.

In the Sliding Filament Mechanism of Muscle Contraction, the Proteins