Which of the following determines the action of a muscle?
A)its fiber architecture
B)the convergence of its endomysia,perimysia,and epimysium
C)how many myosin-actin cross-bridges it forms
D)its line of pull relative to the joint it crosses

Question

Quizplus · Accepted Answer

The line of pull of a muscle, or the direction in which it pulls along its tendon, determines the action of the muscle relative to the joint(s) it crosses. For example, a muscle with a vertical line of pull will produce flexion and extension at the joint, while a muscle with a horizontal line of pull will produce abduction and adduction. The other options may affect the muscle's strength or force production, but they do not directly determine its action.

Which of the Following Determines the Action of a Muscle