THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Kidneys filter blood and form a liquid which contains metabolic wastes, excess water and salts. This liquid is called urine.

Detailed explanation-2: -The kidney and urinary systems help the body to eliminate liquid waste called urea, and to keep chemicals, such as potassium and sodium, and water in balance. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body.

Detailed explanation-3: -These include (a) ammonia, (b) urea, and (c) uric acid. Birds, reptiles, and most terrestrial arthropods, such as insects, are called uricothelic organisms because they convert toxic ammonia to uric acid or the closely-related compound guanine (guano), rather than urea.

Detailed explanation-4: -Answer: Solution: Nitrogenous waste in urine is in the form of urea and uric acid. The unit of human kidney is called nephrons.