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 need to analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Understanding ECG**:
- ECG stands for electrocardiogram. It is a test that records the electrical activity of the heart over a period of time. It provides a graphical representation of the heart's electrical impulses during the cardiac cycle.

2. **Analyzing the Statements**:
- **Statement 1**: "It is a graphical representation of the electrical activity of the heart during the cardiac cycle."
- This statement is **true**. The ECG indeed provides a graphical representation of the heart's electrical activity.

- **Statement 2**: "The ECG of a person is obtained by using a machine called electrocardiogram."
- This statement is **false**. The ECG is not a machine; it is the test itself. The machine used to perform the ECG is called an electrocardiograph.

- **Statement 3**: "To obtain the standard ECG, a patient is connected to the machine with three electrical leads."
- This statement is **true**. A standard ECG typically involves connecting the patient to the electrocardiograph using multiple leads (often three or more).

- **Statement 4**: "Each peak in the ECG is identified with the letter from P to T that corresponds to a specific electrical activity of the heart."
- This statement is **true**. The peaks (P, Q, R, S, T) represent different phases of the heart's electrical activity.

3. **Identifying the Incorrect Statement**:
- Based on the analysis, the incorrect statement is **Statement 2**, which claims that the ECG is obtained by using a machine called electrocardiogram. The correct terminology is that the ECG is the test, and the machine is called an electrocardiograph.

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

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