Human body is entirely known as organism. Human body consists of various organ systems, each of which comprises of number of organs whose functions complement each other. Each organ system performs a particular tasks. These organ systems interact to produce coordinated, active, healthy and intelligent human body. All human being have same organ system with the exception of reproductive system.
Human body consists of billions of cells which are organized into tissues. Each tissue consists of similar types of cell. One or more types of tissue work together inside an organ, such as bone or a lung. Internal organs are linked together to form a system that has one or more major roles.