The muscular system generates body heat and provides locomotion to the human body. It is a complex organ system that spans the entire skeletal system.
Muscles are specialized tissues that have the ability to contract and relax in response to electrical impulses known as action potentials. As they contract and relax, muscles provide locomotion for organ systems, provide stability and posture, produce heat and allow for thermoregulation, aid in blood circulation and help in digestion. The muscular system is composed of skeletal, smooth and cardiac muscles that cover the entire human body. Each type of muscle provides different functions for different parts of the human body.