The bronchial airways must be open and clear so that air can reach the alveoli, where oxygen is absorbed into the bloodstream and carbon dioxide is released during exhalation. The hemoglobin in the bl...The bronchial airways must be open and clear so that air can reach the alveoli, where oxygen is absorbed into the bloodstream and carbon dioxide is released during exhalation. The hemoglobin in the blood must be in adequate amounts to sufficiently carry the oxygen to the tissues, where it is released and carbon dioxide is absorbed and carried back to the lungs.
