Cardiac Cycle
Cardiac Cycle: Overview
This Topic covers sub-topics such as Cardiac Cycle, Cardiac Output, Electrocardiogram, Atrial Systole, Ventricular Systole, Joint Diastole, P-wave in Electrocardiogram, T-wave in Electrocardiogram and, QRS complex in Electrocardiogram
Important Questions on Cardiac Cycle
Given below is the ECG of a normal human. Which one of its components in human is correctly interpreted below


When ventricular systole occurs:


During the cardiac cycle, the ventricular systole starts about after the atrial systole. This allows atria to be completely empty their contents to ventricles. Which one of the following is a major reason for this delay?

The above ECG indicates the following disorder

Match the following
List - I | List - II | ||
a | Enlarged wave | i | Hyper calcimia |
b | Prolonged interval | ii | Tachy cardia |
c | Prolonged interval | iii | Brady cardia |
d | Shortened interval | iv | Myocardial infraction |
v | Enlarged atria |

Which one of the following is a matching pair?
a) Lubb - sharp closure of AV valves at the beginning of ventricular systole
b) Dub - sudden opening of semilunar valves at the beginning of ventricular diastole
c) Pulsation of the radial artery - valves in the Arteries
d) Initiation of the heart beat - Purkinje fibres

During ventricular systole in a mammalian heart the

ECG depicts the depolarization and repolarization processes during the cardiac cycle. In the ECG of a normal healthy individual, one of the following waves is not represented.

P wave of ECG indicates:
1. Activation of SA node.
2. Depolarization of atrial muscles.
3. Spread of excitation from AV node to Purkinje fibres.
4. Repolarisation of atria and depolarization of ventricles.


Identify the correct sequence of events in a cardiac cycle.

The duration of the cardiac cycle in a normal man is

The diagram given here is the standard of a normal person. The - wave represents the?


In a standard which one of the following alphabets is the correct representation of the respective activity of the human heart?

In , what is represented by -wave, complex and -wave respectively?


