They are in our skin and produce sweat.

It is a liquid that contains water, waste substances and mineral salts and is expelled through the skin.

It is a liquid that contains waste substances, water and mineral salts and is produced in the kidneys.

They are bean-shaped organs that filter the blood to trap waste substances and mix them with water to produce urine.

They are long tubes that connect kidneys to the bladder.

It is a bag-shaped organ that stores urine until it is full and contracts to expel it.

It is a tube that expels the urine from the body.