Term
| The right and left atria are separated by the.. |
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Definition
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Term
| The right and left venticles are separated by the.. |
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Definition
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Term
| Low O2 blood enters the right atrium through 3 vessels, what are they? |
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Definition
| SVC, IVC, and coronary sinus |
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Term
| Where is the coronary sinus located? |
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Definition
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Term
| Blood goes from the right atrium to the right ventricle via what valve? |
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Definition
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Term
| Where does the blood go after the right ventricle? |
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Definition
| pulmonary semilunar valve - pulmonary trunk - R&L pulmonary arteries - lungs |
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Term
| High O2 blood returns to the heart via what? |
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Definition
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Term
| Blood in the left atrium goes thru what valve to get to the left ventricle |
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Definition
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Term
| where does blood go after the left ventricle? |
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Definition
| aortic semilunar valve - aorta - throughout the body |
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Term
| At the beginning of the cardiac cycle all of the chambers are relaxed and which valves are open? |
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Definition
| the av valves (tricuspid and bicuspid) |
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Term
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Definition
| blood enters both atria at same time and flows down thru the av valves in to the ventricles filling them 70% |
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Term
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Definition
| both atria contract at the same time from top to bottom completely filling the ventricles |
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Term
| Describe the cardiac cycle after active filling |
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Definition
| there is a 0.1 second delay - ventricles contract from bottom up - AV valves close - shortly the semilunar valves open pumping blood to the "greater arteries" for 0.3 seconds, semilunars close and back to start |
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Term
| ____ is the contraction of the ventricles. |
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Definition
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Term
| ______ is the relaxation of the ventricles. |
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Definition
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Term
| What causes the heart sound LUB represent? |
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Definition
| closing of the AV valves, the beginninf of systole |
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Term
| What causes the heart sound DUP? |
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Definition
| closing of the semilunar valves, beginning of diastole (end of systole) |
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Term
| What are the specialized cardiac cells involved in the electrical system of the heart? |
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Definition
| the SA node, the AV node, the bundle of HIS, bundle branches, Purkinje fibers |
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Term
| What does the SA node do? |
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Definition
| est basic heart rate, sends an action potential to both atria (strtn cardiac cycle) causing contraction |
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Term
| What does the AV node do? |
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Definition
| stimulated by the SA node it sends the action potential along the bundle of HIS - bundle branches - Purkinje fibers - causing ventricular contraction |
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Term
| What does the P wave represent? |
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Definition
| atrial contraction, the SA node firing |
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Term
| What does the QRS complex represent? |
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Definition
| ventricular contraction, systole, LUB |
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Term
| What does the T wave represent? |
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Definition
| ventricular relaxation, diastole, DUP |
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Term
| What does the R-R interval rep.? |
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Definition
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Term
| What does the PQ interval rep.? (PR) |
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Definition
| length of atrial contraction |
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Term
| Whatdoes QT interval rep.? (RT) |
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Definition
| length of ventricular contraction (systole) |
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Term
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Definition
| the amount of blood pumped out of one ventricle per minute |
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Term
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Definition
| the amount of blood pumped out of one ventricle per cycle |
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Term
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Definition
| ventricular filling time, the volume of blood just before the ventricles contract |
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Term
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Definition
| emptying time, the amount of blood leftover after systole |
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Term
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Definition
| the percentage of EDV that got pumped out avg = 50% |
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Term
| What 2 factors determine EDV? |
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Definition
| venous pressure and length of diastole |
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Term
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Definition
| veins drain blood into heart. filling pressure. increase venous pressue = increased EDV |
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Term
| How does the length of diastole determine EDV? |
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Definition
| how long does it take to fill? longer diastole = increased EDV |
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Term
| What 2 factors dertermine ESV? |
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Definition
| aterial pressure and strength of ventricular contraction |
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Term
| What is arterial pressure and how does it determine ESV? |
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Definition
| pressure exerted against the inside of the arterial walls is the same as the pressure on the semilunar valves. higher arterial pressure = higher ESV |
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Term
| How does the strength of ventricular contraction determine ESV? |
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Definition
| increased strength = decreased ESV |
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Term
| What is Starling's Law of the Heart? |
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Definition
| the greater the stretch of the ventricle wall, the greater the strength of the contraction. |
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Term
| According to Starlings Law, low EDV requires... |
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Definition
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