Question

The pO2 of air in an alveolus is ________________ that of the pO2 in deoxygentaed blood in a pulmonary capillary

a. greater than
b. less than
c. equal to

Answer 1

The correct answer is a. greater than

Step-by-step explanation:

The partial pressure of oxygen in alveolus is greater than partial pressure of oxygen in deoxygenated blood in a pulmonary capillary and this concentration difference is important for the movement of air(oxygen) from the alveolus to the pulmonary capillary because gases move from higher concentration to lower concentration.

By this process the oxygenated blood reaches to the heart from lungs and heart then pump this oxygenated blood to other body tissues.The partial pressure of oxygen in alveolus is 104 mmHg and in venus blood is 40 mmHg.