Lesson 3 | The Excretory System
2. A bean-shaped organ called the bladder filters wastes from the blood. 3. Urine leaves the kidneys through the urethra. 4. Some wastes exit the body in a fluid called area. 5. The organs of the digestive system regulate fluid levels and eliminate wastes from the body. 6. The actual filtration of blood occurs within the millions of ureters in ... ................
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