Respiration. Definitions. Breathing(ventilation)- process of moving air into and out of the lungs. Two phases- Inspiration(inhalation) into lungs Expiration(exhalation) out of lungs. Air. Inspired Expired Oxygen 21% 16% Carbon dioxide 0.04% 4%
Oxygen 21% 16%
Carbon dioxide 0.04% 4%
Nitrogen 78% 78%
Water vapour Variable Saturated
After O2 diffuses across the respiratory membrane into the blood approx. 98.5% of the O2 combines irreversibly with the haemoglobin, becoming oxyhaemoglobin.
Approx. 1.5% remains dissolved in the plasma.