Biology - Human Body Systems - Excretory system - Excretory Organs and Their Waste
Four sections showing different excretory organs. Section 1: 'KIDNEYS - Filter blood to remove urea (from protein breakdown), excess water, and excess salts. Produce urine. Two kidneys filter ~180 liters of blood per day! Urine stored in bladder.' Section 2: 'LUNGS - Remove carbon dioxide (waste fro