Practice Exam 3.3 Key PDF

Key 1. What does the P, QRS, and T wave represent electrically and mechanically? P: Atrial Contraction/Depolarization QRS: Ventricular Contraction/Depolarization T: Ventricular Relaxation/Repolarization 2. What are the Intrinsic variables th...

Key 1. What does the P, QRS, and T wave represent electrically and mechanically? P: Atrial Contraction/Depolarization QRS: Ventricular Contraction/Depolarization T: Ventricular Relaxation/Repolarization 2. What are the Intrinsic variables that influence Heart Rate? Conduction System Functional Syncytium 3. What are the Intrinsic variables that influence Stroke Volume? Auto-Regulation/(Starling Mechanism) 4. What effect does Acetylcholine have on the CV system? Decrease Heart Rate 5. What effect does ADH/AVP have on blood volume and vascular diameter? Increase Blood Volume, and Decrease Vascular Diameter (Vasoconstrict) 6. What does stimulation of a Beta-1 receptor cause?. Increase Heart Rate Increase Contractility 7. For the Myocyte action potential, please state the ion movement during the following phases a. Phase 0: Rapid influx via Na+ VGCs b. Phase 3: Closing of Ca++ VGCs/Efflux via open K+ VGCs 8. What is Preload, and how can it be modified? Preload is Venous Return to the Heart. It can be modified by movement of the body. 9. What physiological agent can act as both a chronotrope and an inotrope? Epinephrine 10. Please create a flow chart to explain how TPR Vasoconstriction would have an effect on Muscular Artery BP?