EXCRETORY SYSTEM

WHAT IS THE EXCRETORY SYSTEM?

System in the body that collects wastes produced by cells and removes the wastes from the body.

WHAT DOES THE EXCRETORY SYSTEM

REMOVE? UREA

Poisonous chemical that comes from the breakdown of proteins

WATER

EXCRETORY ORGANS

KIDNEYS Act as filters Blood flows through

kidneys, wastes are removed from the blood

One drop of blood will pass through the kidneys 300 times a day

Each kidney contains about 1 million filtering factories called nephrons.

NEPHRONS Filtering factories

in kidneys Removes wastes

from blood (urea,water), sends needed materials (glucose, water) back to blood

URINE Nephrons form a liquid

wasted called URINE.

Made up of urea, water, and other wastes.

Bright Yellow Lots of urea

Clear Lots of water

URETER Urine exits the

kidneys and travels through the URETER.

Narrow tubes that connect to the bladder.

BLADDER A saclike muscular

organ that stores urine.

When the bladder is full enough, that is the walls are stretched, you feel a need to urinate.

Bladder hold approx. 2 cups of urine.

URETHRA Small tube

connects bladder to the outside of body.

Muscle at the end of the urethra contracts and relaxes to remove urine.

DIALYSIS People who do not have

functioning kidneys undergo dialysis.

Blood is removed from body, is filtered through a machine which cleans the blood.

It removes wastes and puts needed materials back into the blood.

The blood then enters the body again.

KIDNEY STONE A kidney stone is a solid

mass of tiny crystals trapped in the kidney or ureter.

Block urine from passing to bladder.

Cause swelling and pain in kidneys.

Can “pass” if small, may need to be surgically removed in too large.

URINARY TRACT INFECTION (UTI)

Infection that can happen anywhere along the urinary tract.

Caused by germs, usually bacteria that enter the urethra and then the bladder. This can lead to infection, most commonly in the bladder itself, which can spread to the kidneys.