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The end of the T-wave in ECG mark the...

The end of the T-wave in ECG mark the

A

beginning of Ventricular systole

B

end of Ventricular systole

C

beginning of atrial diastole

D

end of atrial diastole

Text Solution

AI Generated Solution

The correct Answer is:
To determine what the end of the T-wave in an ECG marks, we can analyze the options provided step by step. ### Step-by-Step Solution: 1. **Understanding the T-Wave**: The T-wave in an ECG represents the repolarization of the ventricles. It occurs after the QRS complex, which indicates ventricular depolarization and contraction. **Hint**: Remember that the T-wave is associated with the recovery phase of the ventricles. 2. **Evaluating Option 1 - Beginning of Ventricular Systole**: This option states that the end of the T-wave marks the beginning of ventricular systole. This is incorrect because ventricular systole begins with the QRS complex, not at the end of the T-wave. **Hint**: Recall that ventricular systole is associated with the contraction of the ventricles, which is reflected in the QRS complex. 3. **Evaluating Option 2 - End of Ventricular Systole**: This option suggests that the end of the T-wave marks the end of ventricular systole. This is correct because the T-wave represents the repolarization of the ventricles, which occurs after they have contracted (during systole). **Hint**: Consider the sequence of electrical events in the heart; the T-wave follows the contraction phase. 4. **Evaluating Option 3 - Beginning of Atrial Diastole**: This option states that the end of the T-wave marks the beginning of atrial diastole. This is incorrect because atrial diastole occurs independently of the T-wave and is not directly marked by it. **Hint**: Atrial diastole is related to the relaxation of the atria, which happens at a different point in the cardiac cycle. 5. **Evaluating Option 4 - End of Atrial Diastole**: This option suggests that the end of the T-wave marks the end of atrial diastole. This is also incorrect, as the end of atrial diastole is marked by the P-wave, which indicates atrial depolarization. **Hint**: The P-wave represents the electrical activity associated with the atria contracting, which is separate from the T-wave. ### Conclusion: The correct answer is **Option 2 - End of Ventricular Systole**. The end of the T-wave in an ECG marks the completion of the ventricular contraction phase.
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