Mrs. Wharton’s Science Class

 System of the body that collects wastes produced by cells and removes the wastes from the body.  Excretion- what the removal process is called. The structures of the excretory system that eliminate urea, water, and other wastes include the kidneys, ureters, urinary bladder, and urethra

 Kidneys- remove urea and other waste material from blood.  Urine- a watery fluid that contain urea and other wastes  Urea- a chemical that comes from the breakdown of proteins  Ureters- narrow tubes where urine flows from the kidneys  Urinary bladder- where urine is carried to ( stores urine)  Urethra- where urine flows going to the outside world

 They filter wastes. 1 st - both wastes and needed material, such as glucose, are filtered out of the blood.  Then- much of the needed materials is returned to the blood, and the wastes are eliminated from the body.

 Excretion maintains homeostasis by keeping the body’s internal environment stable and free of harmful levels of chemicals.  In addition to the kidneys, organs of excretion that maintain homeostasis include lungs, skin and liver.