Urinary (Excretory) System 2.3

The urinary system removes waste materials.

Life processes produce waste.

I. Life processes produce waste.A. The urinary system gets rid of liquid waste from

the blood.B. The respiratory system gets rid of water vapor

and waste gases from the blood.C. The digestive system disposes of solid waste

products from food.D. The skin gets rid of wastes through sweat.

The urinary system disposes of liquid waste products removed from the blood.

The respiratory system disposes of water vapor and waste gases from the blood.

The skin releases wastes through sweat glands.

The digestive system disposes of solid waste products from food.

The urinary system removes waste from the blood.

Urinary System

kidneys

ureters

filter

wastes

bladder

urethra

The ureters are tubesthat carry waste from the

kidneys to the bladder.

The urinary system removes waste from the blood.

I. The urinary system removes waste.A. The urinary system filters the blood.B. The urinary system contains several structures.

1. The kidneys are the body’s filters.2. The ureters move waste from the kidneys to the

bladder.3. The bladder stores urine.4. The urethra is the passage from the bladder out of

the body.

The kidneys, which are about 10 centimeters long, act as filters for the

blood.I. Inside each kidney there are about one

million nephrons.A. First, the blood enters through the

glomerulus.

B. Second, nutrients and water are filtered out.C. Third, waste products travel to the end of the

nephron and are moved to the ureters.

The kidneys regulate the amount of water in the body.

Too much water causes the body to swell.

Too little water interferes with cell processes.