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22 Cards in this Set
- Front
- Back
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contraction of heart when blood leaves chamber (ventricle contraction) |
systole |
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relaxation of heart chambers (ventricular relaxation) |
diastol |
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complete round of cardiac systole and diastole |
cardiac cycle |
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when are the av valves closed? |
during ventricular systole |
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what event causes av valves to open? |
atrial pressure exceeds ventricular pressure |
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when are semilunar valves closed? |
during artial systole |
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what causes semilunar valves to open? |
ventricular pressure is higher than in the aorta |
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are both sets closed at any given point? if yes, when? |
yes momentarily after atrial and ventricular systole |
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are both vavles open during any part of the cycle? |
no |
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in what part of the cycle is the pressure in the heart the highest? the lowest? |
ventricular contraction ventricular diastole |
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what event results in pressure deflection called the DICROTIC NOTCH |
momentary increase in aortic pressure when semilunar valve shuts |
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normal cardiac cycle length |
0.8 sec |
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time interval of atrial contraction |
0.1 sec |
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the quiescent period |
0.4 sec |
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time interval of ventricular contraction |
0.3 sec |
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2 factors that promote movement of blood through the heart |
alternate contraction& relaxation of myocardium opening and closing of heart vavles. & relaxation of myocardium opening and closing of heart vavles. |
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alternating surges of pressure in each contraction and relaxation of left ventricle? |
pulse |
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the pressure blood exerts on area of blood vessel wall |
blood pressure |
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name instrument used to compress artery and record pressures while taking blood pressure |
sphygmomanometer |
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what are the sounds of KOROTKOFF? |
indicate resumption of blood flow to artery being occluded when taking b.p. |
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what causes systolic sound? what causes the disappearance of systolic sound? |
artery constriction, restricted blood flow artery is no longer constricted smooth blood flow |
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systolic pressure? diastolic pressure? |
pressure in arteries at peak ventricular contraction pressure during ventricular relaxation |
