Which system removes waste from your body and helps control water balance?

• A. Excretory system
• B. Digestive system
• C. Endocrine system
• D. Circulatory system

Answer: (A)

The excretory system is responsible for removing waste and keeping the body’s water balance steady. The kidneys filter blood to remove metabolic wastes like urea and any excess water and salts, producing urine that leaves the body. Hormones such as ADH help control how much water is reabsorbed by the kidneys, fine-tuning fluid balance to prevent dehydration or overhydration. Sweat glands also contribute to waste excretion by releasing some water and salts. Other systems have different primary jobs—digestion handles food and solid waste, the endocrine system uses hormones to regulate processes, and the circulatory system transports substances and helps move wastes around—so the excretory system best fits the description.