Unformatted text preview: 17. What is autorhythmicity? 18. Know the sequence of events of an action potential in the pacemaker cells of the heart. 19. What is the mechanism of action of Ach on the heart muscle? 20. What is the mechanism of action of norepinephrine on heart rate? 21. Draw a flow diagram of the conduction system of the heart starting at the SA node. 22. What is the difference between bradycardia and tachycardia? 23. What do the P, QRS, R, and T waveforms represent? 24. What does an abnormal S-T interval indicate? What does a prolonged Q-T interval indicate? 25. Define systole and diastole. 26. What is cardiac output? 27. Define the following: EDV, ESV, SV, ejection fraction, preload, and afterload. 28. Briefly describe the factors that affect heart rate. 29. Know the factors that are involved in regulation of cardiac output as depicted on page 686. 30. What is the arterial (Bainbridge) reflex? 1...
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- Spring '10
- Cardiology, heart rate, cardiac muscle cells