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

SKINExcretory products:watermineral saltsureaMethod: Sweating

LUNGSExcretory products: water vapour carbon dioxide Method:Exhaling

KIDNEYSExcretory 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.

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

URETERTube that carries urine from the kidney to the bladder

BLADDERTemporary storage for the urine before removal

URETHRATube 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