Myosin cross bridges attach to actin strands, bend, detach, and then attach lower. These actions result in the __________ of the muscle fibers.
A) shortening
B) lengthening
C) activating
D) elongating
E) stretching

Question

Quizplus · Accepted Answer

The attachment, bending, and detachment of myosin cross bridges to actin strands is known as the sliding filament theory. This theory explains how the interactions between myosin and actin filaments cause the muscle fiber to shorten, resulting in muscle contraction. Therefore, the correct choice for the blank is A) shortening.

Myosin Cross Bridges Attach to Actin Strands, Bend, Detach, and Then