AP BIOLOGY

Detailed explanation-1: -Yes, urea is a nitrogenous waste. Excretion: Excretion is the process by which nitrogen-containing waste products of metabolism are eliminated from the body. The main source of nitrogenous waste in humans is Urea excretion is known as ureotelism, and the animals that do so are known as ureotelic animals.

Detailed explanation-2: -Urea serves an important role in the metabolism of nitrogen-containing compounds by animals. It is the main nitrogen-containing substance in the urine of mammals. Urea is a colorless, odorless solid, highly soluble in water, and practically non-toxic.

Detailed explanation-3: -Under steady-state conditions, renal nitrogen excretion equals nitrogen intake. Renal nitrogen excretion consists almost completely of urea and ammonia.

Detailed explanation-4: -The kidneys filter the urea and expel the urea outside the body. Some of the urea is retained in the matrix of the kidney to maintain a desired osmolarity in the organisms. Humans are ureotelic as we expel the urea through urine.

Detailed explanation-5: -Nitrogenous wastes which are removed by the kidneys are urea and ammonia. Urea is the main excretory product that is filtered and excreted out from the blood by the kidneys. Ammonia is mostly converted into urea in the liver and excreted out in the urine.