The main function of the kidney was to release the waste into blood stream.
define kidney ?
In vertebrates, the kidneys are two reddish-brown bean-shaped organs. They are located on the left and right sides of the retroperitoneal space and are about 12 centimetres (4+12 inches) long in adults. They get blood from the linked renal arteries and get blod from the paired renal veins. Each kidney is connected to a ureter, which is a tube that transports expelled pee to the bladder.
The kidney regulates the amount of various bodily fluids, fluid osmolality, acid-base balance, electrolyte concentrations, and toxin elimination. Filtration takes place in the glomerulus, where one-fifth of the blood volume entering the kidneys is filtered. Reabsorbed substances include solute-free water, salt, bicarbonate, glucose, and amino acids.
so the main role of kidneys was to eliminate the waste from the body through the urine.
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