Respiratory System
Hyperbaric oxygen therapy is breathing 100% oxygen while under about three atmospheres of pressure (normal air is 20% oxygen). Normal arterial blood oxygen concentration when at one atmosphere of pressure is about 100 mmHg. Use Henry’s law to decide the likely value from the list below, of arterial blood oxygen concentration of a patient undergoing hyperbaric oxygen therapy.
1500 mmHg
500 mmHg
300 mmHg
100 mmHg
1500 mmHg
Henry’s law states “the amount of gas that will dissolve in water is proportional to its partial pressure”. The ppO2 in an atmosphere of 100% oxygen is about five times normal. In addition, air at three times normal atmospheric pressure has ppO2 about three times normal. Hence, the blood oxygen concentration will be 5 ร 3 = 15 times normal. 15 ร 100 mmHg = 1500 mmHg.
1500 mmHg Henry’s law states “the amount of gas that will dissolve in water is proportional to its partial pressure”. The ppO2 in an atmosphere of 100% oxygen is about five times normal. In addition, air at three times normal atmospheric pressure has ppO2 about three times normal. Hence, the blood oxygen concentration will be 5 ร 3 = 15 times normal. 15 ร 100 mmHg = 1500 mmHg.
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