This system protects against disease by identifying and killing pathogens and tumor cells.
This system delivers oxygen and nutrients to cells while transporting away carbon dioxide and other waste materials.
This systems filters the blood and produces, stores and eliminates urine.
In humans, this system's function is to allow gas exchange in the aveoli.
This system is the body's speedy, electrochemical communication system.
This system is a collection of glands that secrete hormones into the blood which regulate growth, development, and homeostasis
The body system that changes food into fuel and absorbs the nutrients for the body.