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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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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