THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Urea, ammonia and creatinine are metabolic waste products in protein metabolism. ‘Metabolic wastes’ also called ‘excrements’, are substances that are formed as by-products in the metabolic processes. These cannot be utilised by the organism and when accumulated in surplus can be toxic. Hence they must be excreted out.

Detailed explanation-2: -As urea goes stale, bacteria convert it back into ammonia, which gives the familiar pungent smell of lavatories. Any condition which impairs the elimination of urea by the kidneys can lead to uremia, a buildup of urea and other nitrogen wastes in the blood that can be fatal.