Which of the following is a false statements?

Options

A. ECG is of a great clinical significance
B. Electrocadiograph is the recording of electrical changes during the cardiac cycle
C. To obtain a standard ECG, a patient is connected to the machine with 3 electrical electrodes (one to each wrist and to the left ankle)
D. Normal activities of the heart are regulated intrinsically

Answer

To determine which statement is false among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Analyze the First Statement:**
- The first statement claims that "ECG is of great clinical significance."
- **Evaluation:** This statement is true. An electrocardiogram (ECG) is indeed a crucial tool in diagnosing and monitoring heart conditions.

**Hint:** Consider the role of ECG in clinical settings.

2. **Analyze the Second Statement:**
- The second statement states, "Electrocardiograph is the recording of electrical changes during the cardiac cycle."
- **Evaluation:** This statement is also true. The electrocardiograph records the electrical activity of the heart throughout its cycle.

**Hint:** Think about what an electrocardiograph measures.

3. **Analyze the Third Statement:**
- The third statement mentions, "To obtain a standard ECG, a patient is connected to a machine with three electrical leads, one to each wrist and to the left ankle."
- **Evaluation:** This statement is true. A standard ECG typically uses three leads placed on the wrists and ankle to monitor heart activity.

**Hint:** Recall the standard lead placement for ECG.

4. **Analyze the Fourth Statement:**
- The fourth statement claims, "Normal activities of the heart, including control of heart rate and cardiac contractility, are intrinsically regulated."
- **Evaluation:** This statement is false. The normal activities of the heart are primarily regulated by the Autonomic Nervous System, not intrinsically.

**Hint:** Consider how the heart rate is influenced by external factors.

### Conclusion:
The false statement among the options provided is the fourth statement, which incorrectly asserts that the heart's activities are intrinsically regulated.

### Final Answer:
The false statement is: "Normal activities of the heart, including control of heart rate and cardiac contractility, are intrinsically regulated." (Option 4)