Question

Which is the major nitrogenous waste product in a human being how is it removed from the body?

Answer 1

Metabolic wastes or excrements are substances that are leftover from metabolic processes (such as cellular respiration) and cannot be used by the organism (because they are surplus or toxic) and must thus be excreted. This includes nitrogen compounds, water, carbon dioxide, phosphates, and sulfates, among other things. These compounds are excreted by animals. Plants have chemical "machinery" that converts some of their constituents (primarily nitrogen compounds) into useful substances.

Complete answer:
Except for carbon dioxide, which is excreted along with water vapour through the lungs, all metabolic wastes are excreted as water solutes through the excretory organs (nephridia, Malpighian tubules, kidneys). The elimination of these compounds allows the organism to maintain chemical homeostasis.

Nitrogenous wastes or nitrogen wastes are the nitrogen compounds that are used to eliminate excess nitrogen from organisms. There are four of them: ammonia, urea, uric acid, and creatinine. Protein metabolism generates all of these substances. In many animals, urine is the primary route of waste excretion; in others, feces is. Urea is the most common nitrogenous waste product in humans. The kidneys eliminate it from the body.

Ureotelism is the process by which urea is excreted. Ammonia is converted into urea in the liver and kidneys of land animals, primarily amphibians and mammals. These creatures are known as ureotelic. Urea is a less toxic compound than ammonia; it eliminates two nitrogen atoms and requires less water for excretion. It takes 0.05 L of water to excrete 1 g of nitrogen, which is only about 10% of what ammonotelic organisms require.

Thus, Urea is the most common nitrogenous waste product in humans. The kidneys eliminate it from the body.

Note: Urea is excreted from the body through the urine. Urea levels in the urine that are abnormal can be an indicator of kidney disease. Blood urea nitrogen (BUN) and urine urea nitrogen (UUN) tests are used to detect urea levels in people who are at risk of kidney failure or end-stage renal disease.