Within the respiratory system the actual exchange of O₂ and CO₂ occurs in the: A) Alveoli B) Bronchi C) Bronchiole D) Capillary system

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The alveoli are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide occurs between the air and the bloodstream. Oxygen diffuses across the alveolar walls and into the capillaries while carbon dioxide diffuses from the capillaries into the alveoli to be exhaled. The bronchi, bronchioles, and capillary system are involved in the respiratory process but do not directly participate in the gas exchange.

Within the Respiratory System the Actual Exchange of O2 and CO2

Within the Respiratory System the Actual Exchange of O₂ and CO₂