Function of the excretory system

Function of the excretory system

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

Answer: (D)

The excretory system exists to remove waste products from the body and keep the internal environment stable. It does this through multiple organs: kidneys filter blood to create urine (liquid waste), the lungs expel carbon dioxide (a gaseous waste), and the skin releases sweat (another liquid waste). The digestive tract also eliminates solid waste. Because it covers all forms of waste—solid, liquid, and gaseous—the statement describing elimination of all these wastes best reflects the system’s overall role. The other options describe functions belonging to other systems or only a part of waste removal.

The excretory system exists to remove waste products from the body and keep the internal environment stable. It does this through multiple organs: kidneys filter blood to create urine (liquid waste), the lungs expel carbon dioxide (a gaseous waste), and the skin releases sweat (another liquid waste). The digestive tract also eliminates solid waste. Because it covers all forms of waste—solid, liquid, and gaseous—the statement describing elimination of all these wastes best reflects the system’s overall role. The other options describe functions belonging to other systems or only a part of waste removal.