Read the following statements (A-D)
A. Coronary Artery Disease is also called atherosclerosis that affects the vessels that supply blood to the heart muscle.
B. The electrocardiogram (ECG) on graph paper.
During a cardiac cycle , the right ventricle pumps out about 70ml of oxygenated blood which is called stroke volume.
D. The second heart sound is associated with the closure of the semilunar valves.
How many statements from the above is / are incorrect ?

Options

A. Two
B. One
C. Four
D. Three

Answer

To determine how many statements from A to D are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement A: "Coronary Artery Disease is also called atherosclerosis that affects the vessels that supply blood to the heart muscle."**
- **Analysis:** This statement is correct. Coronary Artery Disease (CAD) is indeed often referred to as atherosclerosis, which involves the buildup of plaques in the coronary arteries that supply blood to the heart muscle.

2. **Statement B: "The electrocardiogram (ECG) on graph paper."**
- **Analysis:** This statement is also correct. An electrocardiogram (ECG) is typically recorded on graph paper, where the electrical activity of the heart is represented in a graphical format.

3. **Statement C: "During a cardiac cycle, the right ventricle pumps out about 70ml of oxygenated blood which is called stroke volume."**
- **Analysis:** This statement is incorrect. The left ventricle is responsible for pumping oxygenated blood to the body, while the right ventricle pumps deoxygenated blood to the lungs. Stroke volume refers to the amount of blood pumped by the left ventricle in one contraction, not the right ventricle.

4. **Statement D: "The second heart sound is associated with the closure of the semilunar valves."**
- **Analysis:** This statement is correct. The second heart sound (dub) is indeed associated with the closure of the semilunar valves (aortic and pulmonary valves) at the end of ventricular contraction.

### Conclusion:
- **Incorrect Statements:** Only Statement C is incorrect.
- **Total Incorrect Statements:** 1

### Final Answer:
There is **1 incorrect statement**.

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