Which of the following statement(s) is/are true concerning the pathophysiology of gas exchange?
A.	Hypoventilation in relation to perfusion can result in an oxygen saturation of less than 100%
B.	Diffusion block and / mismatch can almost completely be overcome by breathing 100% oxygen
C.	Transpulmonary shunting does not occur under normal circumstances
D.	The normal arterial oxygen saturation should be 100%
Answer:A
Which of the following statement(s) is/are true concerning the pathophysiology of gas exchange?
A.	Hypoventilation in relation to perfusion can result in an oxygen saturation of less than 100% B.	Diffusion block and / mismatch can almost completely be overcome by breathing 100% oxygen C.	Transpulmonary shunting does not occur under normal circumstances D.	The normal arterial oxygen saturation should be 100%