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High Pressure.docx

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KINS 2295

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High Pressure  At sea level the pressure of air is one atmosphere or 760 mmHg.  The person have to go 33 feet underwater to increase 1 atm to 2 atm.  Liquid cannot be compress, but gases can.  As the pressure increase the volume decrease.  Pressure effect- as the person go down the pressure increases this affect the inspiratory muscles and it will affect the total lung volume. If we increase the size of the snorkel it also increase the pulmonary dead space.  As the diver descends the lungs are getting squeezed -> the lung volume goes down -> the blood from the pulmonary capillaries are getting sucked out and it goes into the alveoli.  When PO2 drops to 60 mm Hg and when PCO2 increase to 50 mm Hg.  Hyperventilating before breathe hold will extend breathe hold time because the value of PCO2 will drop from 40 mmHg to around 15-20 mmHg. However people may lose conscious.  This happens when a person hyperventilate before diving. As the person descends the lungs will get compress and the partial pressur
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