Homeostasis
The System
Heart
The heart helps you breathe and it pumps blood into your body so you will not run out.
Lungs
Lungs are characteristic of vertebrates other than fish, though similar structures are present in some other animal groups.
Muscles
Muscles is a band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body.