[Effect of exogenic hypercapnia on external respiration and oxygen transport function of lungs]

The functioning of the respiratory system and oxygen-transport function of the lungs were estimated in experiments on healthy people under the effect of exogenic hypercapnia. The external respiration is activated under conditions of hypercapnia of the given degree, an increase in the total and alveolar ventilation of the lungs testifies to this fact. Age differences are found in diffusive and specific diffusive capacity of the lungs for O2, which indicates to changes in the oxygen-transport function of the lungs. In teenagers the diffusive capacity of the lungs changes due to the gas-exchange surface area and in people of middle age - due to changes in the diffusive properties of the lungs air-blood barrier.