The largest amount of water leaves the body via which of the following routes?

• A. feces
• B. urine
• C. sweat
• D. exhaled air

Answer: (B)

Verified step by step guidance

1. Understand the concept of water loss in the body: The human body loses water through various routes, including urine, feces, sweat, and exhaled air. Each route contributes differently to overall water loss.
2. Analyze the role of urine in water excretion: The kidneys regulate water balance by filtering blood and producing urine. Urine is the primary route for excreting excess water and waste products, making it the largest contributor to water loss.
3. Compare other routes of water loss: Feces contain a small amount of water, primarily for lubrication and waste elimination. Sweat is used for thermoregulation and contains water, but its contribution depends on activity level and environmental conditions. Exhaled air contains water vapor, but the amount is relatively small compared to urine.
4. Consider physiological mechanisms: The kidneys are highly efficient in maintaining homeostasis, and they adjust urine production based on hydration levels. This ensures that urine remains the dominant route for water loss under normal conditions.
5. Conclude based on evidence: Based on the physiological processes and the relative contributions of each route, urine is the correct answer as the largest amount of water leaves the body through this route.