Which of the following statements is incorrect for ECG of human heart ?

Options

A. It is graphical representation of the electrical activity of the heart during a cardiac cycle.
B. The ECG of a person is obtained by using a machine called electrocardiogram .
C. To obtain a standard ECG , a patient is connected to the machine with three electrical leads.
D. Each peak in the ECG is identified with e letter from P to T that corresponds to a specific electrical activity of the heart .

Answer

To determine which statement is incorrect regarding the ECG (electrocardiogram) of the human heart, we will analyze each option based on our understanding of ECG.

### Step-by-Step Solution:

1. **Understanding ECG**:
- An ECG is a test that records the electrical signals of the heart. It provides information about the heart's rhythm and can help diagnose various heart conditions.

2. **Identifying the Components of ECG**:
- The ECG consists of several waves:
- **P wave**: Represents the depolarization of the atria.
- **QRS complex**: Represents the depolarization of the ventricles.
- **T wave**: Represents the repolarization of the ventricles.

3. **Evaluating the Statements**:
- **Statement A**: "It is a graphical representation of the electrical activity of the heart during the cardiac cycle."
- This is correct as ECG indeed provides a graphical representation of the heart's electrical activity.

- **Statement B**: "ECG of a person is obtained by using a machine called electrocardiogram."
- This statement is incorrect. The machine used to record an ECG is called an electrocardiograph, not an electrocardiogram. The electrocardiogram is the actual recording produced by the machine.

- **Statement C**: "To obtain a standard ECG, the patient is connected to the machine with three electrical leads."
- This statement is correct. Typically, multiple leads are used to obtain a comprehensive view of the heart's electrical activity.

- **Statement D**: "Each peak in the ECG is defined with a letter from P to T that corresponds to the specific electrical activity of the heart."
- This statement is also correct as each wave (P, QRS, T) corresponds to specific electrical activities in the heart.

4. **Conclusion**:
- The incorrect statement is **Statement B**, as it misidentifies the machine used to obtain an ECG.

### Final Answer:
The incorrect statement is: **B**: "ECG of a person is obtained by using a machine called electrocardiogram."