Card Set Information
33 29 ALD into thin air ELISA
the phase of the heart beat when heart ventricular muscle contracts and pumps blood from chambers -> arteries
the phase of the heart beat when ventricular muscle relaxes and allows the chambers to fill with blood
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?
At what point in the cardiac cycle is the pressure in the heart the highest?
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?
What portion of the cardiac cycle is shortened with a more rapid heart rate?
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
The time interval of atrial systole
The ventricular contraction period
The quiescent period, or pause
The monosyllables describing the heart sounds are
lub - dup
The first heart sound is a result of the closure of the
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
The chambers that have just been emptied are the
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