The chemistry of breathing

In the blood, there are N, O2, CO2, trace argon, carbon monoxide, methane.
Nitrogen in the blood in an amount which corresponds to its solubility in water at body temperature and at a partial pressure in the atmosphere. The nitrogen content in the blood is 1.2 percent by volume, under the same conditions, water can dissolve 0.9 percent by volume. Nitrogen in the arterial and venous blood contained in equal amounts. Participation in breathing nitrogen does not accept.

The arterial blood contains 18-20 volume percent O2 and 50-52 percent by volume CO2. The venous blood – 10-12 percent by volume of O2 and 55-57 percent by volume of CO2. Arterial blood is saturated with 96% O2 and venous – 66%.
Since at body temperature and a pressure of 14231 Pa (partial pressure of O2 in the alveolar air) 100 g of the blood can be dissolved only 0.31 cc O2, r. F. 0.3%, it follows that almost all of O2 in the blood coupled with hemoglobin.

Solubility of CO2 in blood is considerably greater than the solubility of O 2, and is 2.5-3%. The content of CO2 in the blood at 17-18 times greater than that corresponding to its solubility at body temperature and at a partial pressure at which it is in the blood. Consequently, most of the CO2 is in the blood is not in the dissolved state, but in the form of carbonate compounds.
Man alone absorbs on average 1 hour per kilogram body mass of 300 cm3 O2 (average 420-500 dm3 per day) and allocates 1 hour per kilogram body mass of 250 cm CO2 (average 380-450 dm3 per day) . Water vapor is released a day 450 cm3.

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