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1. aortic valve- largest artery in the body.

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2. arrhythmias- abnormal heart rhythms and can be mild to life threatening.

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3. arteries- carries blood away from the heart.

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4. blood- flows through the circulatory system.

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5. capillaries- connect arterioles with venules the smallest veins.

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6. circulatory system- referred to as the transportation of the body.

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7.   diastole- brief period of rest.

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8. endocardium- smooth layer of cells the lines the inside of the heart and is continuous with the inside of blood cells.

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9. erythrocytes- red blood cells.

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10. hemoglobin- a complex protein composed of the protein molecule.

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11. left atrium- receives oxygenated blood from the lungs.

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12. left ventricle- pumps oxygenated blood from the lungs to the rest of the body.

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13. leukocytes- white blood cells.

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14. mitral valve-allows blood to flow to the aorta and preventing blood from flowing back into the left atrium.

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15. myocardium- thickest layer, muscular middle layer.

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16. pericardium- double layered membrane, covers the outside of the heart.

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17. plasma- 90% water with many dissolved or suspended substances.

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18. pulmonary valve- blood vessel that carries blood to the lungs.

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19. right atrium- receives blood as it returns from the body.

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20. right ventricle- receives blood from the right atrium and pumps the blood into the pulmonary artery.

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21. septum- muscular wall that separates the heart into a right side and a left side.

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22. systole- period of ventricular contraction.

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23. thrombocytes- also knowns as platelets, helps stopping the bleeding.

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24. tricuspid valve- regulate the flow of blood from the right atrium to the right ventricle.

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25. veins- blood vessels that carry blood back to the heart.