You are working on a gerontology unit. You admit a 77-year-old with respiratory problems. You know that the amount of respiratory dead space increases with age. What do these changes result in?
A) Increased diffusion of gases
B) Decreased diffusion capacity for oxygen
C) Decreased shunting of blood
D) Increased ventilation
Ans: B
Feedback: The amount of respiratory dead space increases with age. These changes result in a decreased diffusion capacity for oxygen with increasing age, producing lower oxygen levels in the arterial circulation. Therefore, options A, C, and D are incorrect.
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