Which body system is primarily responsible for the elimination of waste products?

The excretory system, also known as the urinary system, is primarily responsible for the elimination of waste products from the body. This system includes vital organs such as the kidneys, ureters, bladder, and urethra, which work together to filter blood, remove waste, and maintain the body's fluid and electrolyte balance. The kidneys play a key role by producing urine, which contains metabolic waste products like urea and creatinine, that are then excreted from the body. This process is essential for maintaining homeostasis and preventing the buildup of harmful substances in the bloodstream.

Other systems, such as the circulatory system, transport nutrients and waste throughout the body but do not specifically eliminate waste. The nervous system regulates bodily functions and responses but does not facilitate waste removal. The respiratory system is primarily involved in gas exchange – taking in oxygen and expelling carbon dioxide – rather than the elimination of solid or liquid waste. Therefore, the excretory system is the key component for waste elimination.