Question

If the blood pressure of the pulmonary artery equals that of the aortic artery, what do...

  1. If the blood pressure of the pulmonary artery equals that of the aortic artery, what do you expect will happen with the efficiency of gas exchange in the lungs? Assume no other changes in fluid transport.

    It will increase

    It will decrease

    It will not change
Science   Anatomy-And-Physiology   
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Answer #1

it will decrease.

There is large pressure difference between the alveoli and the blood coming from the capillary, this difference in partial pressure accounts for efficient gas exchange, for eg, the partial pressure for oxygen in the alveoli is 104 mm Hg, while the partial pressure of oxygen in the blood capillary is about 40 mm Hg, this large pressure difference causes oxygen to diffuse from alveoli into the blood, without the large difference in partial pressure between the alveoli and the blood, oxygen does not diffuse efficiently

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