What organ system includes muscles and allows for body movement?

The muscular system is the organ system responsible for body movement. It consists primarily of muscles that contract and relax to produce motion, maintain posture, and generate heat through metabolic processes. Muscles work in conjunction with the skeletal system, where skeletal muscles are attached to bones and enable the body to perform a wide range of movements, from simple actions like walking to complex activities like playing a sport.

Muscles can be categorized into three types: skeletal, cardiac, and smooth. Skeletal muscles are voluntary and are under conscious control, enabling precise movements. Cardiac muscle is found in the heart and is involuntary, while smooth muscle is found in internal organs and also functions involuntarily. Each muscle type plays a distinct role in the body, but the overarching function of the muscular system is to facilitate movement.

In the context of bodily functions, other organ systems mentioned do not primarily facilitate movement. The endocrine system regulates hormones and metabolic processes, the nervous system coordinates bodily functions and responses but does not directly perform movement like muscles do, and the cardiovascular system is responsible for the circulation of blood throughout the body. Therefore, the muscular system is correctly identified as the system that primarily encompasses muscles and enables body movement.