What is the primary excretory product in humans?

💡 Solution & Explanation

Human beings are classified as ureotelic organisms because their primary metabolic nitrogenous waste is converted into urea in the liver through the urea cycle and excreted by the kidneys. Aquatic animals typically excrete toxic ammonia directly, while birds and reptiles excrete uric acid to conserve bodily water. Excreting urea requires moderate water loss compared to ammonia and uric acid respectively. A related medical condition is uremia, which occurs when high levels of urea accumulate in the blood due to kidney dysfunction.