Which system eliminates waste from the body?

• A. Excretory System
• B. Integumentary System
• C. Lymphatic System
• D. Muscular System

Answer: (A)

The system that removes wastes from the body is the excretory system. It includes the kidneys, ureters, bladder, and urethra, and it works by filtering the blood to remove metabolic wastes, excess salts, and extra water, which become urine and are then expelled. The kidneys perform the core processes of filtration, reabsorption, and secretion to concentrate wastes into urine, which travels down the ureters to the bladder and is excreted through the urethra.

Other parts of the body contribute to waste removal as well—such as the skin releasing sweat and the lungs expelling carbon dioxide—but the excretory system is the primary system dedicated to eliminating wastes from the body. The remaining options are involved in protection, immunity, movement, or general body function rather than waste elimination.