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Whta is pressure in lungs-positive or negative?

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negative pressure:is a pressure less than surounding fluid(such as air)

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Negative and positive pressure?  Negative pressure in the lungs?  What is positive pressure breating?  Negative and positive pressure breathing?  Why is pleural pressure negative during expiration?  What would happen if lungs lost its negative pressure?  What pressure is always negative and helps to keep the lungs inflated?