There is a pair of bean-shaped organs P in the human body towards the back just above the waist. A waste product Q formed by the decomposition of unused proteins in liver is brought into organ P through blood by an artery R The numerous tiny filters S present in organ P clean the dirty blood goes into circulation through a vein T . The waste substance Q other waste salts and excess water form a yellowish liquid U which goes from organ P into a bag like structure V through two tubes W This liquid is then thrown out of the body through a tube X .Name (1) artery R and (2) vein T