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Fundamentals- Cardio

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What vessel is the site of greatest resistance to flow?   show
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What effect does Alpha receptor stimulation have on arterioles?   show
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show False. Modified by sympathetic activity and vasoactive substances  
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What shift in blood would tx with a sympathetomimetic cause?   show
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show Inc'd sympathetic tone --> decrease compliance --> dec'd capacitance --> blood shifted to arterial side.  
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show CHF can result from dec'd peripheral venous compliance. Blood shifted to arterial side and inc'd pressure aorta has to pump against --> inc'd pressure in pulmonary system --> pulmonary edema. Tx by increasing venous compliance (VASO ACTIVE SUBSTANCE).  
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What is the most important factor in blood flow resistance?   show
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Will dilating a capillary bed inc or dec total resistance (assuming parallel system) and blood pressure?   show
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show blood flowing over obstruction  
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show systolic-diastolic pressure  
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Mean arterial pressure   show
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show volume of blood ejected from one ventricle in a single cycle.  
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In what tissue of the heart are conducting cells found?   show
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An increase in conduction velocity of the AV node will do what to stroke volume/ CO?   show
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show It is relatively stabilized during phase 2.  
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show AV node, 40-60  
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What are the unique features of SA node AP?   show
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show Phase 4- Longer than normal. Repolarization slowed by SLOW Na+ channels. These channels also --> next AP  
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show Atria only.  
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A drug that reduces inward flow of Ca+ during phase 2 (plateau) will have what effect on contractility and likely belongs to what class of drug?   show
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An increase in HR has what effect on contractility?   show
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show Positive ionotropic  
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How will inc'd preload affect ventricular pressure-volume loop?   show
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show Pressure work is much more costly. Small inc in BP very costly compared to much inc'd volume at same BP.  
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show ventricular hypertrophy.  
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How does ventricular hypertrophy effect CO?   show
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