The human body is a collective term for all physical aspects and organs that make up an individual person. It includes the skeletal system, muscular system, nervous system, circulatory system, endocrine system, respiratory system, digestive system, urinary system, reproductive system, and other organ systems. The human body is made up of billions of cells that work together to carry out various functions necessary for survival, growth, and repair. It also includes external structures such as the skin, hair, nails, and mucous membranes. Overall, the human body serves as a complex machine that allows humans to interact with their environment, perform physical activities, and experience emotions.