Across
- 2. the two upper chambers of the heart; singular version of this is atrium
- 5. the ability to pump blood effectively throughout the body
- 7. pertaining to the heart and blood vessels
- 8. rhythmic pressure against the walls of an artery
- 9. occurs when the ventricles relax
- 12. large blood vessels that carry blood to all regions of the body
- 14. plasma fluid after the blood cells and the clotting proteins have been removed
- 15. blood cells involved in defending the body against infective organisms and foreign substances
- 16. mature red blood cells produced by red bone marrow
- 17. a double-walled membranous sac that encloses the heart
- 19. the oxygen-carrying blood protein pigment of erythrocytes
- 21. the middle and thickest layer of the heart; also the cardiac muscle
- 23. located between the left atrium and left ventricle
Down
- 1. the smallest blood vessels in the body
- 3. the two lower chambers of the heart
- 4. a hollow, muscular organ located in the thoracic cavity
- 6. the measurement of the amount of systolic and diastolic pressure exerted against the walls of the arteries
- 10. occurs when the ventricles contract
- 11. the inner lining of the heart
- 13. controls the opening between the right atrium and right ventricle
- 18. the largest blood vessel in the body
- 20. the external layer of the heart
- 22. straw-colored fluid that contains nutrients, hormones, and waste products