How do muscles produce the force that results in movement?

Question

Quizplus · Accepted Answer

Muscles produce force by shortening or resisting lengthening. This is due to the contraction of muscle fibers, which pull on tendons and create movement. The contraction is initiated by the activation of neurons, but the actual production of force is through the physical change in length of the muscle fibers. Hormones may regulate muscle contraction, but they do not directly produce force. Elongation does not produce force, but rather requires force to resist the lengthening.

How Do Muscles Produce the Force That Results in Movement