B.P. in the pulmonary artery is :

Options

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

Answer

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

1. **Identify the Source of Blood in the Pulmonary Artery**: The pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.

2. **Understand the Function of the Pulmonary Artery**: Since the pulmonary artery is responsible for transporting blood away from the heart, the blood pressure in this artery is relatively high. This is necessary to ensure that blood can reach the lungs effectively.

3. **Compare with the Pulmonary Vein**: The pulmonary vein, on the other hand, carries oxygenated blood from the lungs back to the left atrium of the heart. As veins generally have lower pressure than arteries, the blood pressure in the pulmonary vein is significantly lower than that in the pulmonary artery.

4. **Conclusion**: Therefore, the blood pressure in the pulmonary artery is higher than that in the pulmonary vein.

5. **Final Answer**: The blood pressure in the pulmonary artery is higher than in the pulmonary vein.