The primary function of the Muscular system is to facilitate movement of the body and its parts. This system consists of various types of muscles, including skeletal, smooth, and cardiac muscles. The skeletal muscles are primarily responsible for voluntary movements, while smooth muscles control involuntary actions in organs. Cardiac muscle is specialized for the heart. Additionally, the muscular system plays a vital role in maintaining posture and producing heat during physical activities, contributing to overall homeostasis within the body.