Question

Which statement correctly describes gas exchange? Gasses are exchanged in the venules. Gasses are exchanged at tissue level. Gasses are exchanged across the alveolar membrane. Gasses are exchanged directly from the blood to the air.

Answer 1

Answer: Gasses are exchanged across the alveolar membrane.

The exchange of gasses takes place across the alveolar membrane of the lungs. Our respiratory system are composed of nose, pharynx, larynx, trachea, bronchi, and lungs (alveoli) where gas exchanges between the blood and external environment by diffusion. Moreover, during the gas exchange, the oxygen enters the blood while carbon dioxide enters the alveoli.