24 Questions
What is the duration of the whole cardiac cycle when the heart rate is 75 beats per minute?
0.8 seconds
During which phase of the cardiac cycle does ventricular diastole occur?
Slow filling phase
What characterizes the Atrial diastolic phase of the cardiac cycle?
Rapid filling phase
Which ventricular phase is associated with AV valves being open and semilunar valves closed?
Isometric contraction phase
What occurs during the Isometric (isovolumic) contraction phase of the ventricular systole?
Ventricles contract
Which statement best describes the Atrial systolic phase?
AV valves open & semilunar closed
What is the characteristic feature of the Rapid (Maximal) ejection phase during the cardiac cycle?
AV valves closed & semilunar open
Which parameter is not monitored during the cardiac cycle?
Blood glucose level
During the isometric (isovolumic) contraction phase, what happens to the ventricular volume?
It remains the same
What is the characteristic heart sound during the slow (reduced) ejection phase?
No sound is heard
What is the main function of the semilunar valves during the ejection phase?
Close to prevent backflow of blood
Which phase marks the beginning of ventricular relaxation?
Isometric (isovolumic) relaxation phase
What happens to the atrial pressure during the rapid (Maximal) filling phase?
It increases gradually
What change occurs in the aortic pressure during the isometric (isovolumic) relaxation phase?
Sharp increase then decrease
What defines the duration of the slow (Reduced) ejection phase?
0.1 sec
Which wave is seen in the ECG during the isometric (isovolumic) relaxation phase?
'T' wave
What happens to the ventricular pressure during the rapid (Maximal) ejection phase?
It markedly increases
During which phase of the cardiac cycle are all valves closed?
Isometric contraction
What is the state of the AV and semilunar valves during the rapid ejection phase?
AV valves open, semilunar valves open
Which phase of the cardiac cycle marks the beginning of the P wave on an ECG?
Atrial systole
What is the characteristic sound heard at the end of the second heart sound during the cardiac cycle?
S3 sound
Which phase of the cardiac cycle is associated with a marked increase in ventricular volume?
Rapid ventricular filling
What condition occurs when the aortic valve becomes calcified and stiff?
Aortic stenosis
Where does the jet of blood from aortic stenosis radiate to when the stiffer valve opens?
Carotid arteries
Learn about the cardiac cycle, including its definition, phases, ventricular pressure changes, and aortic pressure changes. Explore the events that occur during heartbeat, such as systole (contraction) and diastole (relaxation), with a duration of 0.8 seconds at a heart rate of 75.
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