Term
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Definition
| continuous inflow of blood from venous system into atrium; atrial pressure slightly higher than ventricular; both chambers are relaxed (Mid Ventricular Diastole) |
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Term
| What segment corresponds with Mid Ventricular Diastole on the ECG |
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Definition
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Term
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Definition
| AV valve is open, blood flows from atrium into ventricle during filling phase of ventricular diastole causing ventricular volume to increase |
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Term
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Definition
| SA node reaches threshold and fires; impulse spreads throughout atria (P wave on ECG) |
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Term
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Definition
| atrial depolarization leads to atrial contraction raising the atrial pressure curve |
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Term
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Definition
| atria squeeze more blood into ventricle (excitation-contraction coupling takes place in delay between P wave and rise in atrial pressure) |
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Term
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Definition
| rise in ventricular pressure as atrial pressure rises resulting from additional volume of blood added to ventricle by atrial contraction; AV node open since atrial pressure still slightly higher than ventricular pressure |
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Term
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Definition
| ventricular diastole ends and ventricular contraction about to begin; atrial contraction and ventricular filling are completed as ventricle reaches EDV (no more blood added) |
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Term
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Definition
| impulse travels through AV node and excites ventricle; atrial contraction ends as ventricles are activated; QRS complex represents ventricular excitation (ECG) |
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Term
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Definition
| ventricular contraction; ventricular pressure curve sharply increases right after QRS complex (signals onset of vent systole); vent (P)ressure higher than atrial P so AV valve closes |
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Term
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Definition
| impulse travels through AV node and excites ventricle; atrial contraction ends as ventricles are activated; QRS complex represents ventricular excitation (ECG) |
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Term
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Definition
| ventricular contraction; ventricular pressure curve sharply increases right after QRS complex (signals onset of vent systole); vent (P)ressure higher than atrial P so AV valve closes |
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Term
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Definition
| AV valve is closed; ventricle is closed chamber |
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Term
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Definition
| no blood enters or leaves ventricle (constant volume); muscle fibers stay at constant length while vent P rises |
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Term
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Definition
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Term
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Definition
| aortic valve opens and ejection of blood begins; aortic P rises as blood is forced into aorta from ventricle faster than blood is draining into smaller vessels at other end point |
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Term
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Definition
| ventricular volume decreases substantially as blood is rapidly pumped out |
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Term
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Definition
| ventricle does not empty completely (approx half)(remaining blood at end of ejection is ESV) |
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Term
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Definition
| T wave (ECG); ventricular repolarization at end of ventricular systole |
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Term
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Definition
| as ventricle repolarizes and starts to relax, vent P falls below aortic P and aortic valve closes |
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Term
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Definition
| closure of aortic valve produces a disturbance on aortic pressure curve (dicrotic notch); no more blood leaves ventricle because aortic valve is closed |
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Term
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Definition
| when aortic valve is closed, AV valve is not open because vent P still higher than atrial P (all valves closed again); no blood enters ventricle from atrium; isovolumetric ventricular relaxation |
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Term
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Definition
| muscle fiber length and chamber volume remain constant as no blood leaves or enters vent; vent continues to relax and P steadily falls |
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Term
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Definition
| vent P falls below atrial P and AV valve opens; vent filling occurs again |
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Term
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Definition
| atrial repolarization and vent depolarization at same time (atria in diastole when vent is in systole); blood flow from pulmonary veins into left atrium; blood pools in the atrium and atrial P rises continuously |
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Term
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Definition
| when AV valve opens at end of vent systole, blood flows from atrium rapidly into vent |
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Term
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Definition
| initial vent filling is fast and then slows down quickly |
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Term
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Definition
| blood continues to flow through from pulmonary veins into left atrium and then through open AV valve into left ventricle; during late vent diastole when vent is slowly filling, the SA node fires again and cycle starts over |
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Term
| what are the main parts of the cardiac cycle and what steps correspond with each |
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Definition
| Mid ventricular diastole (1-2); Late ventricular diastole (3-6); End of ventricular diastole (7); ventricular excitation and onset of ventricular systole (8-9); isovolumetric ventricular contraction (10-11); ventricular ejection (12-14); end of ventricular systole (15); ventricular repolarization and onset of ventricular diastole (16-18); isovolumetric ventricular relaxation (19-20); ventricular filling (21-25) |
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