Which body system is primarily involved in eliminating nitrogenous wastes from the body?

Which body system is primarily involved in eliminating nitrogenous wastes from the body?

• A. Excretory System
• B. Integumentary System
• C. Endocrine System
• D. Digestive System

Answer: (A)

Eliminating nitrogenous wastes from the body is handled mainly by the excretory system. The kidneys filter blood to remove waste products such as urea, uric acid, and creatinine, forming urine that exits the body. Nitrogenous wastes originate from protein metabolism; ammonia is converted to urea in the liver, which is then carried in the bloodstream to the kidneys for excretion. The kidneys’ processes—filtration, plus selective reabsorption and secretion—also help regulate fluid and electrolyte balance, which is part of why this system is central to waste disposal. Other systems don’t play the primary role here. The integumentary system (skin) does excrete some wastes in sweat, but it’s not the main route. The digestive system handles ingested material and eliminates solid waste, with some nitrogen-containing components ending up in feces, but nitrogenous waste elimination is largely a function of the excretory (urinary) system. The endocrine system manages hormones, not waste removal. So, the excretory system is the primary pathway for getting rid of nitrogenous wastes.

Eliminating nitrogenous wastes from the body is handled mainly by the excretory system. The kidneys filter blood to remove waste products such as urea, uric acid, and creatinine, forming urine that exits the body. Nitrogenous wastes originate from protein metabolism; ammonia is converted to urea in the liver, which is then carried in the bloodstream to the kidneys for excretion. The kidneys’ processes—filtration, plus selective reabsorption and secretion—also help regulate fluid and electrolyte balance, which is part of why this system is central to waste disposal.

Other systems don’t play the primary role here. The integumentary system (skin) does excrete some wastes in sweat, but it’s not the main route. The digestive system handles ingested material and eliminates solid waste, with some nitrogen-containing components ending up in feces, but nitrogenous waste elimination is largely a function of the excretory (urinary) system. The endocrine system manages hormones, not waste removal.

So, the excretory system is the primary pathway for getting rid of nitrogenous wastes.