Cardiac Cycle Lec 16 _ 10_24

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Aerospace Engineering

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Dec 6, 2023

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Module 18 review Clicker question Which one of the following occurs immediately before the P wave in the ECG? A) Positive ions flow through gap junctions in the ventricles B) Funny channels open in the pacemaker cells in SA node C) Ventricles repolarize D) The AV valves close E) Voltage-gated Na + channels open in the ventricular cardiomyocytes O T a +ria ventricles repolarize i & ↑ SA node AB Q
Action potential in pacemaker cells Module 18 review
Cardiac conduction Module 18.4
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AV valves opening Semilunar valves opening Module 18.2
Blood flows down a pressure gradient Module 19.2
Cardiac cycle 2+3 = ventricular systole 4+1 = ventricular diastole lub dub Systole Diastole Diastole Ventricular filling Ventricular filling Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation Module 19.2
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When is the blood volume in the left ventricle the greatest? Systole Diastole Diastole Ventricular filling Ventricular filling Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation A B C D E Module 19.3
When is the blood volume in the left ventricle the least amount? Systole Diastole Diastole Ventricular filling Ventricular filling Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation A B C D E Module 19.3
Ventricular volume Semilunar valves Left ventricle Module 19.3
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When is the pressure in the aorta greatest? Systole Diastole Diastole Ventricular filling Ventricular filling Atrial contraction Isovolumetric contraction Ventricular ejection Isovolumetric relaxation A B C D E Module 19.4
Aortic pressure in aorta Semilunar valve SP = systolic pressure DP = diastolic pressure MAP = mean arterial pressure Module 19.4
Which of the following is TRUE of the ventricular filling phase of the cardiac cycle? A) Ventricular filling occurs during systole. B) All valves in the heart are open. C) Ventricular pressure is less than aortic pressure. D) Ventricular pressure is greater than atrial pressure. E) Ventricular pressure is decreasing. Clicker question Module 19.4
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Atrium and ventricle pressure Take a look at pressure in the left atrium and left ventricle during the cardiac cycle 1 2 3 4 1. When do the AV valves open and when do they close? 2. Why does the ventricular pressure rise quickly during phase 2 and 3?
Why does the ventricular pressure decrease part way through the 3 rd phase? A) Ventricle muscle relaxes B) Ventricle repolarization C) The muscle contraction produces less force (it fatigues) D) Blood in ventricle goes into the aorta Clicker question Module 19.4
Cardiac cycle summary heart sounds ventricle filling
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Practice questions 1. The second heart sound occurs when the semilunar valves close; thus, it marks A) The end of the ejection period B) The beginning of the ejection period C) The beginning of systole D) The beginning of the isovolumetric contraction E) Both C and D are true Module 19.4 2. What occurs during the interval between the end of the T-wave and the next P-wave in the ECG? [select all] A) The SA node depolarizes B) Ventricular ejection C) The aorta reaches the systolic blood pressure D) Atria fill with blood from the veins E) AV valves are open F) Semilunar valves are open

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