Heart Physiology
1. What are the 2 major types of muscle cells found in the heart?
2. Which of these cells just described exhibit the property of autorhythmicity?
3. What does autorhythmicity mean?
4. In myocardial contractile cell, the rapid depolarization phase is due to the entry of
.
5. What ionic movement is responsible for the plateau phase of these fibers?
6. What is the significance of the plateau phase in terms of myocardial contraction?
7. Do myocardial autorhythmic cells have a stable or unstable membrane potential?
8. What ions are responsible for the depolarization of these autorhythmic fibers?
9. If you cut all the nerves to the heart, will it continue to beat?
. Explain
10. Define systole and diastole
11. What percent of the blood that enters the ventricles does so due to ventricular systole?
12. How does the remainder of that blood enter the ventricles?
13. What does end diastolic volume mean and what is its approximate value?
14. How much blood is pumped out of the ventricles during isovolumetric contraction?
15. Explain your answer to the previous question.
16. What does end systolic volume mean and what is its approximate value?
17. What does stroke volume mean and what is its approximate value?
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