. Which of the following are true of the alveoli?
Blood continuously flows in one direction, exchanging carbon dioxide for oxygen
The surrounding vessel of the alveoli is an artery
Red Blood cells carry CO2 (carbon dioxide) and O2 (oxygen)
Oxygen molecules diffuse diffuse from a high concentration to a low concentration
Carbon Dioxide diffuses from a lower concentration to a higher concentration
The correct statements are:
- Blood continuously flows in one direction, exchanging carbon dioxide for oxygen
- Red Blood cells carry CO2 (carbon dioxide) and O2 (oxygen)
- Oxygen molecules diffuse from a high concentration to a low concentration