AFAA Personal Trainer Certification Practice Exam 2026 - Free Personal Trainer Practice Questions and Study Guide

The primary function of the muscular system is to facilitate movement. The muscles work in conjunction with the skeletal system to produce motion, whether it’s through voluntary actions like walking and lifting or involuntary actions such as the beating of the heart or digestion. This system is composed of various types of muscle tissue, including skeletal, smooth, and cardiac muscles, each playing a pivotal role in enabling the body to move efficiently and respond to external stimuli.

While the muscular system does contribute to the overall structure of the body and participates in maintaining posture, its main role lies in generating movement through contraction and relaxation of muscle fibers. This essential capability allows for everyday activities, athletic performance, and bodily functions, underscoring the critical nature of movement in human physiology.