Which outputs are involved in waste removal by the excretory system during physical activity?

Which outputs are involved in waste removal by the excretory system during physical activity?

• A. Sweat and exhaled carbon dioxide
• B. Urine and feces
• C. Sweat and urine
• D. Bile and urine

Answer: (D)

During physical activity the body has to get rid of waste while also cooling itself. The two outputs most tied to exercise are sweat and carbon dioxide exhaled from the lungs. Sweat is produced by the skin to help cool the body and also carries away water and small amounts of soluble wastes. At the same time, our metabolism speeds up, so more carbon dioxide is produced and expelled through breathing. Together, these two processes capture the common waste removal linked to exercise. Bile and urine aren’t paired outputs specifically tied to activity in this way—the liver’s bile isn’t a waste expelled during exercise, and while urine is an excretory product, the combination that best reflects waste removal during activity is sweat plus exhaled CO2.

During physical activity the body has to get rid of waste while also cooling itself. The two outputs most tied to exercise are sweat and carbon dioxide exhaled from the lungs. Sweat is produced by the skin to help cool the body and also carries away water and small amounts of soluble wastes. At the same time, our metabolism speeds up, so more carbon dioxide is produced and expelled through breathing. Together, these two processes capture the common waste removal linked to exercise.

Bile and urine aren’t paired outputs specifically tied to activity in this way—the liver’s bile isn’t a waste expelled during exercise, and while urine is an excretory product, the combination that best reflects waste removal during activity is sweat plus exhaled CO2.