As an astronaut is lifted into Earth's orbit,what is the first change to take place in response to the drop in cabin pressure?
A)increased hematocrit
B)renal hypoxia
C)increased alveolar ventilation rate
D)decreased alveolar PO₂
E)decreased hemoglobin saturation

Question

Quizplus · Accepted Answer

The drop in cabin pressure will cause a decrease in the partial pressure of oxygen (PO₂) in the alveoli, leading to a decrease in the alveolar PO₂. This can cause hypoxemia, which is a common concern for astronauts in space.

As an Astronaut Is Lifted into Earth's Orbit,what Is the First