Lab Final!

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SYSTOLE

the phase of the heart beat when heart ventricular muscle contracts and pumps blood from chambers -> arteries
DIASTOLE

the phase of the heart beat when ventricular muscle relaxes and allows the chambers to fill with blood
Cardiac Cycle

the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next
When are the AV valves closed?

during ventricular systole
What event within the heart causes the AV valves to open?

when the ventricular pressure is lower than atrial pressure
When are the semilunar valves closed?

during the diastole of the heart as a whole and during atria systole
What event causes the semilunar valves to open?

the ventricular pressure is greater than the pressure in arteries leaving their chambers
Are both sets of valves closed during any parts of the cycle? When?

yes, momentarily after atrial systole and ventricular systole
Are both sets of valves open during any part of the cycle?

no
At what point in the cardiac cycle is the pressure in the heart the highest?

ventricular systole
Lowest?

ventricular diastole
What event results in the pressure deflection called the dicrotic notch?

momentary increase in aortic pressure that occurs when semilunar valve snaps shut
If someones heart rate is 80bpm, what is the length of the cardiac cycle?

0.75 sec
What portion of the cardiac cycle is shortened with a more rapid heart rate?

ventricular relaxation
What two factors promote the movement of blood through the heart?

alternate contraction and relaxation of myocardium, and opening and closing of the heart valves
The length of a normal cardiac cycle

0.8 sec
The time interval of atrial systole

0.1 sec
The ventricular contraction period

0.3 sec
The quiescent period, or pause

0.4 sec
The monosyllables describing the heart sounds are

lub - dup
The first heart sound is a result of the closure of the

AV valves
The second heart sound is a result of the closure of the

semi lunar valves
The heart chambers that have just been filled when you hear the first sound are the

ventricles
The chambers that have just been emptied are the

atria
Immediately after the second heart sound, the ___ and ___ fill with blood

atria and ventricles
Which valve is heard most clearly when the apical heartbeat is auscultated

bicuspid valve

Author

Anonymous

122952

Card Set

Lab Final!

Description

physio

Updated

2011-12-12T04:39:21Z