The biological process involved in the in the removal of narmful metabolic wastes from the body is called excretion. nutrition respiration transportation as in other process like nutrition,respiration,transportation different organisms use different strategies to do excretion. in case of unicellular organisms waster are removed from body surface into the surrounding water by the process called diffusion. but in case of mulli-cellular organisms, specialized are evolved to perform excretion.
the chief organ that is involved in excretion in kidneys. the excretion system of human beings consists of Right kidney, Left kidney, Right ureter, Left ureter.
Kidneys are located in the abdomen , on elther side of the backbone. kidney is the basic filtration unit. is consists of very thin-walled blood capillaries. each capillary cluster is associated with cap staped end of a tube that cllects filtered urine. each kidney has large number of filtration units called NEPHRONS packed close together.the waste products or nitrogenous wastes that are collected from the blood in the form of urine. waste products or nitrogenous wastes . the produced urine passes through ureters into urinary bladder. the urine is stored in the urinary bladder and the urine is released to outside through urethra. the process of urine formation takes place in three steps.The nitrogenous wastes such as urea, uric acid are removed from blood in the kidneys. the process of urine formation takes place in Nephron