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Across 1. Separate the aorta from the left ventricle that prevents blood from flowing back into the left ventricle 4. Returns blood to the right atrium of the heart from bodily parts below the diaphragm 5. Returns blood to the right atrium of the heart from the upper half of the body 7. Study of tissues 9. A tentative answer to a well-framed question that can be tested by an experiment 10. An iron-containing protein that binds oxygen and is the primary component of erythrocytes 12. composed of the heart, blood vessels, and blood 14. A device that raises, transfers, delivers, or compresses fluids or gases 15. A measurement of heart electrical activity 16. Study of the heart and its action and diseases 17. Pressure in the arteries during contraction of the ventricle 19. Stage of the heart cycle in which the heart muscle contracts and the chambers pump blood 21. Deals with the properties of liquids and gases 23. Stage of the heart cycle in which the heart muscle is relaxed, allowing the chambers to fill with blood 24. An instrument for measuring blood pressure 26. A chamber of the heart that receives blood from the veins 28. Major cell component of blood whose primary function is to carry oxygen 29. A component blood that lacks a nucleus and assists in blood clotting 30. Membrane that encloses the heart 31. Pressure exerted by the blood upon the walls of the blood vessels 32. Guards the opening between the left atrium and the left ventricle

Down 2. Uses positive pressure to move a fluid 3. Pressure that remains in arteries between heart contractions 6. Fluid part of blood or lymph 8. Carries blood from the heart to be distributed by branch arteries through the body 11. A white blood cell that defends against foreign materials 13. Removal and examination of tissue, cells, or fluids from the living body 18. Situated at the opening of the right atrium of heart into the right ventricle 19. A small mass of tissue that is made up of purkinje fibers, ganglion, and nerve fibers, that originates the impulses stimulating the heartbeat 20. Any of the tubular branching muscular and elastic-walled vessels that carry blood from the heart through the body 22. An integrated group of cells with a common function, structure, or both 25. Smallest structural unit of living matter capable of functioning independently 27. Temporarily closes a passage or orifice, or permits movement of fluid in only one direction