An organ system is a group of organs that work together to perform a specific bodily function. Humans have several organ systems, including the cardiovascular, respiratory, nervous and musculoskeletal systems. The cardiovascular system, which is composed of the heart, blood vessels and blood, circulates blood throughout the body.
The respiratory system is made up of the nose, mouth, pharynx, larynx, trachea, bronchi and lungs. This system facilitates the exchange of gases between the air outside the body and gases in blood.
The brain, spinal cord and nerves are part of the nervous system. This system coordinates the workings of the other systems and responds to stimuli from the environment.
The musculoskeletal system contains muscles, tendons, ligaments, bones and joints. This system allows a person to move through muscle contraction and expansion.