Heart Discussion q- x Heart Discussion Questions 1. Police captain Jeffers had a

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Heart Discussion q- x Heart Discussion Questions 1. Police captain Jeffers had a myocardial infarction. He has an ejection fraction (SV divided by EDV) of only 25 His stroke volume is 40 ml and his heart rate is 100 beats per minute. A) What are his EDV, ESV, and CO? Explain the physiological mechanism of treatment. 2. Refractory Period. A) Which heart cells have a refractory period in their action potential? B) How is the prolonged refractory period generated in cardiac muscle? C) What is the advantage of a prolonged refractory period? D) Would you recommend a dnug that prolongs or shorten the plateau phase of the cardiac muscle cell action potentials for patients with tachycardia? Explain why. 3. Intrinsic Conduction System. A) What is the intrinsic conduction system? B) Which component will activate the myocardium? C) If the SA node fails, what will happen to heart rate? D) What is the purpose of the AV node delay? 4. ECG and Heart Sounds, A) What causes the first and second heart sound? B) When during the ECG does the first heart sound occur (be specific: before/during/after the wave)? When does the second heart sound occur? C) Are the ventricle contracting or relaxing to cause the first and second heart sound? D) A friend tells you an ECG revealed that her son has a slight heart murmur. Should you be convinced that he has a heart mummur? Explain why. 5. Heart Structure. A) Describe the structure of the intercalated discs. B) What is the functional importance of the intercalated discs of cardiac muscle? C)The heart is called a double pump" because there are two functionally separate circulations Compare and contrast the two pumps (i,e, function. side, volume punn New support center number OR 952-967-7ooo.

Explanation / Answer

question 1

Police Captain Jeffers has an ejection fraction (SV divided by EDV) of only 25%. His stroke volume is 40 ml/beat, and his heart rate is 100 beats/min. What are his EDV, ESV, and CO?

f (SV/EDV = 0/25.

If SV = 40 mL,

EDV = 160 mL.        SV = EDV -ESV, so

ESV - 120 mL.         CO=HRxSV = 4 L/min)

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