Which of the following statement is incorrect?

Options

A. The amount of blood pumped each minute by heart often can be increased by more than 100% due to parasympathesis stimulation
B. Lumen of arteries is narrower as compared to veins due to presence of thicker smooth muscle layer
C. Cardiovascular centre is located in medulla oblongata of brain
D. Waves indicating repolarisation of atria are not represented in a standard ECG

Answer

To determine which statement is incorrect, we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Analyze Statement 1:**
- Statement: "The amount of blood pumped each minute by the heart often can be increased by more than 100% due to the parasympathetic."
- Explanation: The parasympathetic nervous system is responsible for slowing down the heart rate, not increasing it. Therefore, this statement is incorrect.

2. **Analyze Statement 2:**
- Statement: "Lumen of arteries is narrower as compared to the veins due to the presence of the thicker smooth muscle layer."
- Explanation: While it is true that arteries have a thicker smooth muscle layer, the lumen of arteries is indeed narrower compared to veins. However, the statement implies that the thickness of the muscle layer is the reason for the narrower lumen, which can be misleading. This statement is somewhat ambiguous but can be considered correct in the context of the comparison.

3. **Analyze Statement 3:**
- Statement: "Cardiovascular center is located in the medulla oblongata of the brain."
- Explanation: This statement is correct. The cardiovascular center, which regulates heart rate and blood pressure, is indeed located in the medulla oblongata.

4. **Analyze Statement 4:**
- Statement: "Waves indicating the repolarization of atria are not present in the standard ECG."
- Explanation: This statement is also correct. In a standard ECG, the repolarization of the atria is not represented by a distinct wave; it is usually obscured by the larger QRS complex.

### Conclusion:
The incorrect statement is **Statement 1**: "The amount of blood pumped each minute by the heart often can be increased by more than 100% due to the parasympathetic."

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