Question: Which of the following represents a correct sequence of events in a cardiac cycle?
A Ventricular systole → atrial systole →joint diastole → ventricular diastole
B Ventricular systole → atrial diastole →joint diastole → ventricular diastole
C Joint diastole → ventricular systole → atrial systole → ventricular diastole
D Joint diastole → atrial systole → ventricular systole →ventricular diastole → joint diastole
Answer: Joint diastole → atrial systole → ventricular systole →ventricular diastole → joint diastole
| Aspect |
Description |
| Introduction |
· Complete sequence of events that occur in the heart during one heartbeat, including both systole (contraction) and diastole (relaxation) phases. |
| Number of Heartbeats |
· In a normal, healthy adult, normal rate of heart beat is about 60 to 100 times per minute. |
| Cardiac Cycle Measurement Instrument |
· Electrocardiography (ECG or EKG)
· Echocardiography
· Invasive methods like cardiac catheterization |
| Cardiac Cycle Sequence |
· Joint diastole → atrial systole → ventricular systole →ventricular diastole → joint diastole |
| Cardiac cycle waves |
· P Wave: Represents atrial depolarization (contraction).
· QRS Complex: Represents ventricular depolarization (contraction).
· T Wave: Represents ventricular repolarization (relaxation).
· ST Segment: Indicates the period when the ventricles are contracting but not repolarizing.
· QT Interval: Represents the time from ventricular depolarization to repolarization. |
