Across
- 2. Sacs in the lungs where oxygen diffuses into the blood and carbon dioxide diffuses into the air
- 4. Protein in the blood. Plasma produced in reaction to antigens that react with and disable antigens
- 6. Removes wastes and regulates blood pH levels.
- 7. Two lower chambers of the heart
- 10. Tube through which urine is passed from the urinary bladder to the outside of the body
- 11. Large, thick-walled muscular vessels that carry oxygenated blood away from the heart
- 12. One of the two sections of the heart that take in blood from the veins
- 13. Foreign substances that stimulates an immune response in the body
- 16. Recognizes diseases
- 21. Small cell fragments in the blood that help blood clot after an injury
- 22. Largest blood vessel in the body: transports oxygen-rich blood from the left ventricle of the heart to the arteries
- 24. Liquid composed of wastes that is filtered from the blood by the kidneys, stored in the urinary bladder and eliminated through the urethra
Down
- 1. Microscopic blood vessels with walls only one cell thick
- 3. A membranous sac in many vertebrates that serves for the temporary retention of urine and discharges by the urethra
- 5. Individual filtering unit of the kidneys
- 8. Iron-containing protein molecule in red blood cells that bind to oxygen and carries it from the lungs to the bodys cells
- 9. Tube that transports urine from each kidney to the urinary bladder
- 14. Carries oxygen to all of the body's cells.
- 15. Force that blood exerts on blood vessels; rises and falls as the heart contracts and relaxes
- 17. Tubelike passageway for air flow that connects with two bronchi tubes that lead into the lungs
- 18. Surge of blood through an artery that can be felt on the surface of the body
- 19. Fluid portion of the blood. 55%
- 20. Any of the large veins by which in air-breathing vertebrates the blood is returned to the right atrium of the heart
- 23. Large blood vessels that carry from the tissues back toward the heart