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Across 2. receives blood from the veins 5. main phase of the heart cycle 9. carries blood between the heart and the gas-exchange tissues of the lungs 12. liquid in which cellular elements are suspended 13. threadlike protein that the thrombin converts the fibrinogen into 16. pumps blood to the gills via large arteries 18. carries blood between the heart and the rest of the body. 20. is the death of the cardiac muscle cells and the resulting failure of the heart to deliver enough blood to the rest of the body. 21. specialized circulatory fluid 22. bits of cytoplasm pinched off from plasma 23. a relay point in the wall between the right atrium and right ventricle. 24. specialized region of the cardiac muscle the maintains the heart pumping rhythm by setting the rate at which the heart contracts

Down 1. blood is pumped through open-ended vessels and flows out among cells. 2. abnormally low amount of hemoglobin or a low number of red blood cell 3. networks of capillaries that infiltrate every organ and tissue in the body 4. returns the blood to the heart 6. consists of a heart and a network of tube like vessels . Blood is confined within these vessels. 7. persistent blood pressure of 140/90 or higher 8. rhythmic stretching of the arteries caused by pressure of the blood forced through the arteries by powerful contractions of the ventricles during systole. 10. “eat” bacteria 11. carry blood away from the heart to organs throughout the body 14. microscopic vessels that form an intricate network among the tissue cells and convey blood between arteries and veins within each organ 15. what capillaries converge into 17. volume of blood per minute the left ventricle pumps into the aorta 19. small vessels that give rise to capillaries