The Sliding Filament Model of Muscle Contraction Argues That

Question

The sliding filament model of muscle contraction argues that:
A)tropomyosin must be removed from the actin molecule before it can bind to myosin.
B)muscle contraction requires energy in the form of GTP.
C)the sarcomere stretches to create contraction.
D)actin filaments slide past myosin, causing the shortening of the muscle fiber.

Accepted Answer

The sliding filament model of muscle contraction proposes that actin filaments slide past myosin filaments, causing the shortening of the muscle fiber. This process is fueled by the hydrolysis of ATP, not GTP, and does not involve the removal of tropomyosin from actin. The sarcomere does not stretch during contraction but rather shortens, and the overlap between actin and myosin filaments increases.