This is a free website for Nuclear Medicine Technologists and Students who wish to broaden their understanding of Nuclear Cardiology Practices and Principles.
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This is a free website for Nuclear Medicine Technologists and Students who wish to broaden their understanding of Nuclear Cardiology Practices and Principles. |
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Review of Section 3 : Self-testThis page is best viewed with Internet Explorer. Position your mouse over the answer button and the answer to the question will appear. 1. What are four characteristics of myocardial tissue that allow it to integrate the heart's electrical and mechanical activity? 2. What is the cardiac cycle? Name the three components of this cycle. 3. Define SYSTOLE and DIASTOLE. 4. What is the first mechanical event of the cardiac cycle? 5. Name 5 components of the cardiac conduction system. 6. What is the heart's pacemaker? Where is it located? 7. What happens when the impulse reaches the terminal ends of the Purkinje fibers? 8. Pacemaker cells need no outside stimulus to generate electrical impulses. What system regulates the rate of cardiac contraction? 9. From what organ does this system originate? 10. In response to exercise or stress, what hormone is released by the sympathetic nerves? 11. What neurotransmitter acts to decelerate the heart rate? 12. Into what vessel does waste-laden blood from the myocardium drain after the nutrient exchange has occurred? 13 . Cardiac muscle cells interconnect to form a syncytium. What is the importance of this characteristic? 14. What happens after an excess of positive charges accumulates on the outside of the cell membrane? 15. Electrical activity in myocardial tissue depends on electrolyte imbalance and a difference in ___________ . 16. Name the two stages of the action potential.
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