Choose the correct statement about muscle contraction.
A)Tropomyosin molecules move and expose specific sites on myosin filaments.
B)Actin filaments slide along myosin filaments.
C)Cross-bridges form between actin and the sarcolemma.
D)Filaments of troponin and tropomyosin slide past one another.

Question

Quizplus · Accepted Answer

During muscle contraction, actin and myosin filaments interact with each other in a sliding filament mechanism. The myosin heads bind to specific sites on the actin filaments, causing them to slide past each other and shorten the overall length of the muscle fiber. Tropomyosin and troponin molecules regulate this interaction by controlling the exposure of the binding sites on the actin filaments. Cross-bridges form between the myosin heads and actin, not between actin and the sarcolemma.

Choose the Correct Statement About Muscle Contraction