Which wastes are eliminated by the excretory system?

• A. Transports oxygen to tissues
• B. Filters blood to form urine
• C. Eliminates solid, liquid, and gaseous waste from the body
• D. Maintains body temperature

Answer: (C)

The excretory system is responsible for removing metabolic wastes from the body in three main forms: solid, liquid, and gaseous. Solid waste comes from the digestive tract as feces, liquid waste is the urine produced by the kidneys as they filter blood, and gaseous waste is primarily carbon dioxide removed by the lungs during breathing. The skin can also contribute a small amount of waste through sweat. This combination of pathways explains why the statement that the system eliminates solid, liquid, and gaseous waste is the best description. The other options describe related processes (oxygen transport, urine formation, or temperature regulation) rather than the specific wastes the system eliminates.