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Blood pressure in the pulmonary artery is

1. same as that in the aorta.
2. more than that in the carotid.
3. more than that in the pulmonary vein.
4. less than that in the venae cavae.

Correct answer: more than that in the pulmonary vein.

Solution

Blood flows from higher to lower pressure, so pressure in the pulmonary artery is higher than in the pulmonary vein. It is not as high as systemic arterial pressure, and it is also not lower than venous pressure in the venae cavae.

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