1. Excretion is the removal of excess minerals from the
body(removing toxic substances) waste products of
metabolism.(urea is a waste product of metabolism.)
Excretive organs are- kidneys Urea, water, salts
Liver bile pigments
Lungs carbondioxide,water
Skin(sweatglands) sweat
2. Normally there are two kidneys commonly referred to as left and right kidney.
Each kidney has an arterial blood supply (the left and right renal arteries) which are
branches of the aorta.
Each kidney has a vein (left and right Renal Vein) which returns filtered blood to the Vena
Cava and therefore the general circulation.
The urine produced by each kidney is transported by each ureter to the
bladder.
