REGULATE water and electrolyte balance (osmoregulation) along with the excretion of metabolic waste and foreign chemicals. • The functional units of mammalian kidneys are called Nephrons.• These nephrons perform the function of filtration of BLOOD and DEPOSITION of the urine in the collecting duct.• This urine is later excreted out from the body through the urethral opening.• A Nephron has three main parts: 1. PROXIMAL Nephron2. Loop of Henle3. Distal Nephron Explanation: • The loop of Henle or Henle’s loop is a hairpin-like structure present between Proximal Nephron (PCT) and Distal Nephron (DCT)• Loop of Henle has two limbs the descending limb and the ascending limb.• The main function of Henle’s loop is to selectively reabsorb water and other important salts like NaCl, this makes the urine more concentrated. Additional information: • The heart is the pumping organ of our body that circulates blood throughout the body• The liver regulates most chemical levels in the blood and EXCRETES a product called bile. This helps carry away waste products from the liver. • Lungs perform the function of breathing.