Scientists typically divide the body into that carry out specific functions:
The body is built from the bottom up, starting at the microscopic level: 11 Organ Systems of the Human Body (Made Easy!) The Human Body
Powered by the heart—a muscle that pumps about 2,000 gallons of blood daily—this system uses a 60,000-mile network of vessels to transport life-sustaining fluid. Scientists typically divide the body into that carry
The human body is an exceptionally complex biological machine, functioning through a highly organized hierarchy of cells, tissues, organs, and systems The Human Body