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Across 1. ________ valve separates the left ventricle from the aorta, the body's largest blood vessel. 5. person has blood pressure that's significantly higher than normal. 6. ______________ circulation sends blood from the heart to all the other parts of our bodies and back again. 7. sending blood into the pulmonary and systemic circulation. 9. _________ valve separates the right ventricle from the pulmonary artery leading to the lungs 11. The two largest veins are the superior and inferior ___________ 13. abnormal sound (like a blowing or whooshing sound) that's heard when listening to the heart. 14. middle part of the artery, made up of a layer of muscle and elastic tissue. 15. connects the arteries and veins. 17. The upper part of the heart is made up of the other two chambers of the heart, called the right and left __________ 18. on the inside and provides a smooth lining for blood to flow over as it moves through the artery. 19. person has blood pressure that's significantly lower than normal. 23. most common heart disorder in adults 24. Blood vessels that carry blood back to the heart are called ________________ 25. wall called the _____________ divides the atria 26. ______________ circulation is a short loop from the heart to the lungs and back again 27. __________ valve separates the right atrium from the right ventricle 28. small area of tissue in the wall of the right atrium, sends out an electrical signal to start the contracting of the heart muscle.

Down 1. Blood flows more slowly through these tiny vessels, allowing time for gases to be exchanged between the capillary walls and the millions of _____________, the tiny air sacs in the lung. 2. Blood vessels carrying blood away from the heart are called __________ 3. wall called the ______________ divides the ventricles. 4. fill with blood from the atria, which makes up the second phase of the cardiac cycle. 8. __________ valve separates the left atrium and the left ventricle. 10. long-lasting disease that causes the heart muscle (the myocardium) to become weakened. 12. tough covering that protects the outside of the artery. 16. right and left _________ pump blood out of the heart. 20. Two __________arteries branch off at the beginning of the aorta and divide into a network of smaller arteries that provide oxygen and nourishment to the muscles of the heart. 21. problems in the heart's rhythm. 22. arteries branch out into _____________