14 Heart flashcards.doc

9 the superior and inferior vena cavae open into

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9. The superior and inferior vena cavae open into which chamber? Right Atrium 10. What chamber is responsible for generating the largest pressure upon contraction Left ventricle 11. Stenosis (blockage) of the mitral valve may cause blood to back up into where? The pulmonary circulation 12. What structure is located between the ventricles and the great arteries? The Semilunar valves 13. If the beating heart makes a “lub- dub” sound, the “dub” sound is caused by what? Vibrations that result from blood hitting the semilunar valves after they slam shut. 14. When the Left & Right Ventricles contract at the same time, what is that called? What are the atria doing during this time? SYSTOLE -Ventricles contract -Atria relax
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Heart Flashcards 15. When ventricles are relaxed, it’s called? What are the atria doing during this time? DIASTOLE: -Ventricles relax -Atria contract 16. What valves close at the start of systole? 17. What valves close at the end of systole? 18. What are the ventricles doing during systole? Start of Systole ( ventricles start to contract) : Closing of the large valves (tricuspid and mitral) End of Systole ( ventricles are relaxing ): S emilunar valves are closed (aortic and pulmonary) Note: Systole means that the ventricles are contracting. 19. What are the ventricles doing when the semilunar valves close? The ventricles are relaxing 20. What are the ventricles doing when the semilunar valves are open? The ventricles are contracting 21. What is the most common heart valve disorder? Mitral valve prolapse 22. Picture of heart depolarization 23. Describe the path that an action potential takes during depolarization of the heart. SA node, AV node, bundle of His, bundle branches, Purkinje fibers. 24. What does the Bundle of His do to the electrical signal pathway?
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  • Fall '08
  • Harrison,C

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