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Select the option that correctly describ...

Select the option that correctly describes ECG phase

A

P - wave - Depolarisation of the ventricles

B

P - wave - Depolarisation of the A node

C

QRS wave - Depolarisation of the ventricles

D

T - wave - Depolarisation of the atria

Text Solution

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The correct Answer is:
To solve the question regarding the correct description of ECG phases, we will analyze the components of an electrocardiogram (ECG) and determine which option correctly describes them. ### Step-by-Step Solution: 1. **Understanding ECG**: - An electrocardiogram (ECG) is a recording of the electrical activities of the heart. It consists of different waves that represent various phases of heart activity. 2. **Identifying the Waves**: - The main waves in an ECG are P wave, QRS complex, and T wave. - Each of these waves corresponds to specific electrical events in the heart. 3. **P Wave**: - The P wave represents **atrial depolarization**. This is the process where the atria (the upper chambers of the heart) contract and push blood into the ventricles. 4. **QRS Complex**: - The QRS complex represents **ventricular depolarization**. This is when the ventricles (the lower chambers of the heart) contract to pump blood out of the heart. 5. **T Wave**: - The T wave represents **ventricular repolarization**. This is the recovery phase of the ventricles after contraction, preparing them for the next heartbeat. 6. **Evaluating the Options**: - Now, we need to evaluate the options provided in the question: - **Option A**: P wave depolarization of ventricles - **Incorrect** (P wave is for atrial depolarization). - **Option B**: P wave atrial depolarization - **Correct**. - **Option C**: QRS wave depolarization of ventricles - **Correct**. - **Option D**: T wave depolarization of atria - **Incorrect** (T wave is for ventricular repolarization). 7. **Conclusion**: - The correct descriptions of the ECG phases are: - P wave: Atrial depolarization - QRS complex: Ventricular depolarization - T wave: Ventricular repolarization - Therefore, the correct option that describes the ECG phase is **Option C**: QRS wave depolarization of ventricles.
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