Find out the wrong statement .

Options

A. SA node is called the pacemaker of the heart
B. Tricuspid valve is located between right atrium and right ventricle
C. By counting the number fo QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual
D. The P-wave represents the depolarization of the atria while QRS complex represents the repolarisation of the ventricles

Explanation

To solve the question "Find out the wrong statement," we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Analyze Option A:**
- The statement says, "SA node is called the pacemaker of the heart."
- The SA node (Sinoatrial node) is indeed known as the pacemaker of the heart because it initiates the electrical impulses that regulate the heartbeat.
- **Conclusion:** This statement is **correct**.

2. **Analyze Option B:**
- The statement says, "Tricuspid valve is located between the right atrium and right ventricle."
- The tricuspid valve is the valve that separates the right atrium from the right ventricle.
- **Conclusion:** This statement is **correct**.

3. **Analyze Option C:**
- The statement says, "By counting the number of QRS complexes that occur in a given time period, one can determine the heartbeat rate of an individual."
- The QRS complex is part of the ECG (electrocardiogram) and indicates the depolarization of the ventricles. Counting these complexes can indeed help determine the heart rate.
- **Conclusion:** This statement is **correct**.

4. **Analyze Option D:**
- The statement says, "The P wave represents the depolarization of the atria, while QRS represents the repolarization of the ventricles."
- The P wave does represent the depolarization of the atria, but the QRS complex represents the depolarization of the ventricles, not repolarization.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
The wrong statement is **Option D**: "The P wave represents the depolarization of the atria, while QRS represents the repolarization of the ventricles."

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