The torque of a muscle (rotary component) is greatest in what position?

Question

Quizplus · Accepted Answer

The torque of a muscle is determined by two factors: the magnitude of the force generated by the muscle and the perpendicular distance between the force vector and the axis of rotation (i.e., the moment arm). Therefore, when the moment arm is longest (choice A) or when the muscle insertion is 90° to the bone (choice B), the magnitude of the torque generated by the muscle is increased. In other positions, the torque may be reduced due to a shorter moment arm or a more oblique angle between the muscle force vector and the bone. Therefore, both choices A and B are correct, and the best answer is C.

The Torque of a Muscle (Rotary Component) Is Greatest in What