Oxygen and carbon dioxide enter and leave the blood in the capillaries of the alveoli. Which statement about this process is correct?
1 )
Oxygen and carbon dioxide only pass through one cell layer to reach their destination.
2 )
Oxygen moves out of the blood and carbon dioxide moves into the blood during gaseous exchange.
Oxygen rapidly diffuses into the alveoli and carbon dioxide rapidly diffuses out of the alveoli due to the large surface area of the alveoli.
4 )
The capillaries have the lowest blood pressure in the body which allows the blood cells to remain in the alveolar capillaries to maximise gas exchange.
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