Search results

Lungs
...  bronchi, the air then passes through each lung until it reaches the alveoli. The oxygen concentration in each air sac is high; this causes the oxygen to pass across the alveolar membrane into the pulmonary capillary. The oxygen then binds to the haemoglobin at the beginning of the pulmonary capillary and carbon dioxide is released. Carbon dioxide concentration is high in the pulmonary  ...