Blood pressure in the pulmonary artery is

Options

A. same as that in aorta
B. more than that in the carotid
C. more than that in pulmonary vein
D. less than that in venacavae

Answer

To determine the blood pressure in the pulmonary artery, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of the Pulmonary Artery**:
- The pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.

2. **Identify the Source of Blood Pressure**:
- Blood pressure in the pulmonary artery is generated by the contraction of the right ventricle, which pumps blood into the pulmonary artery.

3. **Comparison with Other Blood Vessels**:
- The blood pressure in the pulmonary artery can be compared to that in other blood vessels, particularly the pulmonary veins and the aorta.

4. **Measurement of Blood Pressure**:
- Blood pressure in the pulmonary artery is typically measured by inserting a catheter into the artery, allowing for direct measurement of the pressure exerted by the blood.

5. **Conclusion on Blood Pressure Levels**:
- The blood pressure in the pulmonary artery is higher than that in the pulmonary veins because the veins carry blood back to the heart at a lower pressure.
- It is important to note that the pressure in the pulmonary artery is lower than that in the aorta, as the aorta has to handle the higher pressure from the left ventricle.

6. **Final Answer**:
- Therefore, the blood pressure in the pulmonary artery is **more than that in a vein** (specifically, the pulmonary vein).

### Answer:
- The correct option is **C: More than in a vein**.

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