The Excretory System

Function: To remove wastes from the body

Digestive OrgansLarge Intestine: It reabsorbs water

from indigestable food and then expels it from the body as feces

Liver: Filters toxins like ammonia

Respiratory OrgansThe lungs remove

carbon dioxide from the body when you exhale

Oxygen and carbon dioxide are exchanged between the alveoli and the capillaries that surround them.

SkinSmall amounts of antibodies,

urea, ammonia, lactic acid, and vitamin C are removed through sweating

Salt (sodium chloride NaCl) is lost when you sweat

Sweat is 99% water and comes from blood plasma filtration

Urinary SystemThe kidneys filter the

blood and remove nitrogen-containing metabolic wastes, toxins and drugs and expel them in urine.

They also maintain the proper balance between water and salts, and between acids and bases.