The respiratory system takes oxygen into the body and eliminates carbon dioxide and water. The excretoty system removes cellular wastes from the blood. Waste leaves the body through the urinary system, a part of the excretory system. The nervous system monitors the outside environment and controls and coordinates body activities. The endocrine system helps control body functions through chemicals called hormones.
Hormones regulate functions such as growth and maturation.
The reproductive system provides a means of producing offspring in order to mainatin the species. This page has been accessed times.