Kidney Function: Filtering Liquid Waste, Not Solid Particles

No, kidneys do not filter out solid waste particles of the blood. The kidneys are responsible for filtering out liquid waste products and toxins from the blood, such as urea, creatinine, and excess water, and regulating the balance of electrolytes and minerals in the body. Solid waste particles, such as fecal matter, are removed by the digestive system through the process of defecation.