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Question
The QRS complex in a standard ECG represents:
The QRS complex in a standard ECG represents:
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Solution
The correct option is A Depolarisation of ventricles
Electrocardiograph is a machine that produces an electrocardiogram (ECG).
The graphical representation of the electrical activity of the heart during a cardiac cycle is called ECG.
A standard ECG has:
P wave that represents the electrical excitation of the atria (depolarisation) which causes contraction of both the atria.
Hence, P wave shows how the electrical impulse spreads across the two atria of the heart.
The atria contract and the blood is pumped into the ventricles. The auricles immediately relax. The electrical impulse then reaches the ventricles which can be seen in the QRS complex.
The QRS complex represents the depolarisation of the ventricles, which initiates the contraction of the ventricles. Contraction begins shortly after the Q wave and the ventricles contract.
The T wave represents the return of ventricles from excited to normal state (repolarisation). The end of the T wave indicates the end of the systole. Thus, the T wave shows that the electrical impulse has stopped spreading, and the ventricles relax.
A standard ECG pattern is produced if the heart is beating steadily.
The ECG is used to evaluate the normal and abnormal cardiac conditions.
Electrocardiograph is a machine that produces an electrocardiogram (ECG).
The graphical representation of the electrical activity of the heart during a cardiac cycle is called ECG.
A standard ECG has:
P wave that represents the electrical excitation of the atria (depolarisation) which causes contraction of both the atria.
Hence, P wave shows how the electrical impulse spreads across the two atria of the heart.
The atria contract and the blood is pumped into the ventricles. The auricles immediately relax. The electrical impulse then reaches the ventricles which can be seen in the QRS complex.
The QRS complex represents the depolarisation of the ventricles, which initiates the contraction of the ventricles. Contraction begins shortly after the Q wave and the ventricles contract.
The T wave represents the return of ventricles from excited to normal state (repolarisation). The end of the T wave indicates the end of the systole. Thus, the T wave shows that the electrical impulse has stopped spreading, and the ventricles relax.
A standard ECG pattern is produced if the heart is beating steadily.
The ECG is used to evaluate the normal and abnormal cardiac conditions.
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