Which of the following identifies the structure primarily responsible for filtering blood?

The kidneys are the primary organs responsible for filtering blood in the human body. They play a crucial role in maintaining homeostasis by regulating electrolyte balance, blood pressure, and the volume of fluids, as well as removing waste products from the bloodstream. The functional units of the kidneys, known as nephrons, filter blood to produce urine, which contains waste materials and excess substances. This filtration process is essential for regulating the body’s internal environment and ensuring that harmful toxins and waste products are excreted.

While the liver also plays a role in processing and filtering substances from the blood, its primary functions involve detoxification, metabolism, and production of biochemicals necessary for digestion. The lungs are mainly responsible for gas exchange, specifically oxygen and carbon dioxide, rather than filtering blood. The spleen helps in filtering blood but primarily focuses on blood cells, particularly as part of the immune system rather than acting as a principal filtering organ for waste elimination.