According to the sliding filament theory, how does muscle contraction occur?
A) Myosin heads form cross bridges and pull thin filaments, causing them to slide.
B) Both thick and thin filaments shorten as the muscle contracts.
C) A bands bunch up and shorten as myosin heads attach to thin filaments.
D) Myosin heads attach and detach from thin filaments, causing thin filaments to shorten.

Question

Quizplus · Accepted Answer

According to the sliding filament theory, muscle contraction occurs when myosin heads form cross bridges with actin (thin) filaments and pull them, causing them to slide along myosin (thick) filaments. This results in the shortening of sarcomeres (the contractile units of muscle fibers) and ultimately the muscle itself.

According to the Sliding Filament Theory, How Does Muscle Contraction