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EXCRETION

Process of removing waste products from the body

If waste is not removed, toxic substances build up and these damage organs in the body.

Excretory organs

Skin

Lungs

Kidney

SKIN

Excretory products:

water

mineral salts

urea

Method:

Sweating

LUNGS

Excretory products:

water vapour

carbon dioxide

Method:

Exhaling

KIDNEYS

Excretory products:

excess water

excess mineral salts

urea

Method:

Urinating

Skin

- Sweat gland absorbs excretory products from blood capillaries.

- Sweat eliminated from sweat glands through sweat pores.

KIDNEY

Excretory organ that removes wastes like urea, water and mineral salts from the blood into the urine.

URETER

Tube that carries urine from the kidney to the bladder

BLADDER

Temporary storage for the urine before removal

URETHRA

Tube that carries urine from the bladder for removal.

Urea from liver is sent to the urinary system. The flow of urea into the urinary system starts from the kidney ---> ureter ---> bladder ---> urethra before being removed in urine.

Human Excretion

Urinary System in Humans