Multiple choice

In which part of the respiratory system does the exchange of gases (oxygen mixes with the blood and carbon dioxide exits from the blood) take place?

  1. Trachea

  2. Bronchi

  3. Bronchioles

  4. Alveoli

  5. Larynx

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

These are air-sacs at the end of bronchioles, and is the place where blood capillaries open. The exchange of gases in alveoli takes place due to pressure differential.