Multiple choice

Where does the exchange of gases take place during breathing?

  1. Nostrils

  2. Trachea

  3. Alveoli

  4. Bronchioles

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The exchange of gases takes place in the alveoli. The walls of the alveoli are surrounded by a network of blood capillaries. Thin walls of alveoli and capillaries allow for O2 to enter the capillaries and CO2 to enter the alveoli for exhalation.