AP BIOLOGY

Detailed explanation-1: -The kidneys act as very efficient filters for ridding the body of waste and toxic substances, and returning vitamins, amino acids, glucose, hormones and other vital substances into the bloodstream. The kidneys receive a high blood flow and this is filtered by very specialised blood vessels.

Detailed explanation-2: -Here’s how kidneys perform their important work: Blood enters the kidneys through an artery from the heart. Blood is cleaned by passing through millions of tiny blood filters. Waste material passes through the ureter and is stored in the bladder as urine.

Detailed explanation-3: -Oxygenated blood is brought to the kidneys from a small branch called the renal artery. The kidneys are highly complicated “filtration factories.” Inside each kidney, the renal artery branches into smaller and smaller parts until they make contact with the core structure of the kidney, the nephrons.