For normal gas exchange in the lung, which of the following is true about oxygen? a) Oxygen moves into the alveoli because the PO2 is higher in the blood than in the alveoli. b) Ox... For normal gas exchange in the lung, which of the following is true about oxygen? a) Oxygen moves into the alveoli because the PO2 is higher in the blood than in the alveoli. b) Oxygen moves out of the alveoli because the PO2 is higher in the alveoli than in the blood. c) Oxygen moves into the alveoli because the PO2 is higher in the alveoli than in the blood. d) Oxygen moves out of the alveoli because the PO2 is higher in the blood than in the alveoli. For normal gas exchange in the lung, which of the following is true about carbon dioxide? a) Carbon dioxide moves into the alveoli because the PCO2 is higher in the blood than in the alveoli. b) Carbon dioxide moves out of the alveoli because the PCO2 is higher in the alveoli than in the blood. c) Carbon dioxide moves into the alveoli because the PCO2 is higher in the blood than in the blood. d) Carbon dioxide moves out of the alveoli because the PCO2 is higher in the blood than in the alveoli.
Understand the Problem
The question is asking about the principles of normal gas exchange in the lungs regarding the movement of oxygen and carbon dioxide based on their partial pressures in the alveoli and blood.
Answer
Oxygen: b) Out of alveoli; carbon dioxide: a) Into alveoli.
For oxygen: b) Oxygen moves out of the alveoli because the PO2 is higher in the alveoli than in the blood. For carbon dioxide: a) Carbon dioxide moves into the alveoli because the PCO2 is higher in the blood than in the alveoli.
Answer for screen readers
For oxygen: b) Oxygen moves out of the alveoli because the PO2 is higher in the alveoli than in the blood. For carbon dioxide: a) Carbon dioxide moves into the alveoli because the PCO2 is higher in the blood than in the alveoli.
More Information
Oxygen diffuses from the alveoli into the blood due to the higher partial pressure in the alveoli. Carbon dioxide moves from the blood into the alveoli as it has a higher partial pressure in the blood.
Tips
Avoid confusing which direction gases move by remembering they move from areas of higher to lower partial pressure.
Sources
- Gas Exchange | Anatomy and Physiology II - Lumen Learning - courses.lumenlearning.com
- Exchanging Oxygen and Carbon Dioxide - Lung and Airway Disorders - merckmanuals.com
AI-generated content may contain errors. Please verify critical information
