Section 3

Urinary System

• Excretion is the removal of metabolic wastes from the body.

• The kidneys are the main organs of excretion and of the urinary system.

• Nephrons are the functional units of the kidneys. Through filtration, reabsorption, and secretion, they remove wastes and return nutrients and water to the blood.

• The urine passes through a ureter and is stored in the urinary bladder until it is eliminated through the urethra.

• Urine must be eliminated from the body to remove toxic materials and to maintain homeostasis.

• The lungs and the skin also play an important role in the excretion of wastes.

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