Body structure refers to the arrangement and organization of different parts within a living organism. In humans, this includes systems such as the skeletal system, which provides support and shape, and the muscular system, which enables movement. Each part works together to maintain overall function and health. At a cellular level, body structure consists of various types of cells that form tissues, such as muscle tissue and nervous tissue. These tissues combine to create organs, like the heart and lungs, which perform specific functions essential for survival. Understanding body structure helps in fields like anatomy and physiology.