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11 Cards in this Set

  • Front
  • Back
primary function of respiratory system
exchange of gases between the external environment and the blood
process of respiration involves
nervous system control
pulmunary ventilation
total volume of gas exchange between the atmosphere and the lungs
alveolar ventilation
volume of air that under goes gas exchange
respiratory pressure
atmospheric pressure of760mmHg serves as a reference point for comparison to respiratory pressures
intrapulmonary pressure (also called intra alveolar pressure)
equals atmospheric pressure when glottis is open and there is no air movement.
intraplueral pressure
negative pressure produced by opposite forces of elastic recoil between the lungs and the chest wall
When does the intraplueral pressure measure negative?
With the glottis open and the alveolar air in communication with the atmosphere, it measures negative compared to intrapulmunary pressure
When does the intraplueral pressure measure positive?
With the glottis closed, during coughing or forced expiration, it measures positive compared to atmospheric air.
What is the importance of negative intrapleural pressure?
normally negative intrapleural pressure prevents lung collapse
Intrathoracic pressure
compared to atmospheric air, negative pressure inside the thoracic cavity equals intrapleural pressure;
w/ forced expiration against a closed glottis, intrathoracic pressure becomes positive.