AP BIOLOGY

Detailed explanation-1: -The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are 3 main steps of urine formation: Glomerular filtration, Reabsorption Secretion. These processes ensure that only waste and excess water are removed from the body.

Detailed explanation-2: -Excretion is a process in which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys, and skin. This is in contrast with secretion, where the substance may have specific tasks after leaving the cell. Excretion is an essential process in all forms of life.

Detailed explanation-3: -Urine is formed in three main steps-glomerular filtration, reabsorption and secretion.

Detailed explanation-4: -The kidneys remove urea from the blood through tiny filtering units called nephrons. Each nephron consists of a ball formed of small blood capillaries, called a glomerulus, and a small tube called a renal tubule.

Detailed explanation-5: -Glomerular Filtration It is the primary step in urine formation. In this process, the excess fluid and waste products from the kidney are filtered out of the blood into the urine collection tubules of the kidney and eliminated out of the body.