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In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?
- a)S - start of systole [2009]
- b)T - end of diastole
- c)P - depolarisation of the atria
- d)R - repolarisation of ventricles
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
In a standard ECG which one of the following alphabets is the correct ...
A normal electrogram (ECG) is composed of a P wave, a QRS wave (complex) and a T wave. The P-wave represents the electrical excitation or depolarisation of the atria. The QRS complex represents the depolarisation of the ventricles which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole. The T-wave represents the repolarisation of ventricles. The encl of the T-wave marks the end of systole.
Most Upvoted Answer
In a standard ECG which one of the following alphabets is the correct ...
Understanding ECG and Heart Activity
An electrocardiogram (ECG) records the electrical activity of the heart, represented by specific waves and intervals. Each component of the ECG corresponds to different phases of the cardiac cycle.
Correct Representation of Activity
Among the options provided, the correct representation is:
- C - P wave: Depolarization of the Atria
The P wave signifies the electrical depolarization of the atria, leading to atrial contraction. This is the first wave seen in an ECG and is crucial for initiating the heart's pumping action.
Explanation of Other Options
- A - S wave: Start of Systole
The S wave is part of the QRS complex, which represents ventricular depolarization and marks the beginning of systole, not a distinct phase on its own.
- B - T wave: End of Diastole
The T wave represents the repolarization of the ventricles, occurring at the end of the ventricular contraction phase (systole), not at the end of diastole.
- D - R wave: Repolarization of Ventricles
The R wave is a part of the QRS complex that indicates depolarization of the ventricles, while the T wave represents repolarization.
Conclusion
In summary, option C correctly identifies the P wave as the representation of atrial depolarization, which is a fundamental aspect of the heart's electrical activity during the cardiac cycle. Understanding these components is essential for interpreting ECGs effectively, especially in medical examinations like NEET.
An electrocardiogram (ECG) records the electrical activity of the heart, represented by specific waves and intervals. Each component of the ECG corresponds to different phases of the cardiac cycle.
Correct Representation of Activity
Among the options provided, the correct representation is:
- C - P wave: Depolarization of the Atria
The P wave signifies the electrical depolarization of the atria, leading to atrial contraction. This is the first wave seen in an ECG and is crucial for initiating the heart's pumping action.
Explanation of Other Options
- A - S wave: Start of Systole
The S wave is part of the QRS complex, which represents ventricular depolarization and marks the beginning of systole, not a distinct phase on its own.
- B - T wave: End of Diastole
The T wave represents the repolarization of the ventricles, occurring at the end of the ventricular contraction phase (systole), not at the end of diastole.
- D - R wave: Repolarization of Ventricles
The R wave is a part of the QRS complex that indicates depolarization of the ventricles, while the T wave represents repolarization.
Conclusion
In summary, option C correctly identifies the P wave as the representation of atrial depolarization, which is a fundamental aspect of the heart's electrical activity during the cardiac cycle. Understanding these components is essential for interpreting ECGs effectively, especially in medical examinations like NEET.
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Community Answer
In a standard ECG which one of the following alphabets is the correct ...
In a standard ECG, the P-wave is a small upward wave that indicates the depolarisation of the atria. This is caused by the activation of SA node.
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In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer?.
In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?a)S - start of systole [2009]b)T - end of diastolec)P - depolarisation of the atriad)R - repolarisation of ventriclesCorrect answer is option 'C'. Can you explain this answer?.
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