How does alveolar pressure compare to atmospheric pressure, during inspiration?
(1) Alveolar pressure is greater than atmospheric pressure.
(2) Alveolar pressure is less than atmospheric pressure.
(3) Alveolar pressure is the same as atmospheric pressure.
(4) Abdominal pressure is lower than atmospheric pressure
Answers
Breathing in and breathing out dependen on the differences in pressure between the lungs and the atmosphere . Pressure created by the movement of gas molecules which are confined in a space.
Pulmonary ventilation depends on 3 types of pressure:
- intra-alveolar
- inter-pleural
- atmospheric
Atmospheric pressure is defined as the amount of force that is exerted by gases in the air surrounding a surface. Atmospheric pressure is expressed in terms of the unit atmosphere in mm Hg(millimeters of mercury). It is normally abbreviated as atm.One atm is equivalent to 760 mm Hg.This is the atmospheric pressure at sea level. Negative pressure is pressure that is lower than the atmospheric pressure, while positive pressure is pressure greater than atmospheric pressure. Pressure that is equal to the atmospheric pressure is zero.