19. Muscles that are found in the heart 20. A tube of musce that pushes urine into the bladder. 21. A hallow muscular organ that pumps blood. 22. Are a pair of spongy, air-filled organs located on either side of the chest of the human body. . Anar 23. A highly complex organ of the body. Stoma 24. Blood vessels that carry blood away from the heart "he body