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Respiratory Part 3

When pressure inside the IAS is greater than the pressure inside the IPS what does the lungs do? Expand. As IPP become more negative the lungs will expand
What happens if the liquid seal between the lungs and wall is broken? Lungs will collapse and the chest wall will move out.
Describe the pressure of the fluid in the intrapleural space The pressure of the fluid is negative because of the opposing tendencies of the lung and the thorax. The fluid in the IPS is subjected to a distending force and its pressure is negative.
When erect where is the pressure variation most dramatic? Apex and base. Weight of lungs causes it to pull away from the apex and rest on the diaphragm making IPP more negative at the apex (-10) and less negative at the base (-2)
What is IPP a measure of? The elasticity of the lungs at the beginning and end of inspiration
Sequence of events of Respiratory cycle Respiratory muscles contract, enlarges the thorax, IPP becomes more negative, Lungs expand, IAP becomes negative, Air movement into the lungs
Is the IPP positive during normal respiratory cycle? No. It solely fluctuates in the negative range but may become positive under special circumstances.
Name one factor that would cause the IPP become + During positive pressure respiration, the outward movement of the lungs "compresses" the IPS and raises its pressure. Anytime inspiration is accompanied by blowing up the lungs IPP becomes +.
Name another factor that causes IPP to become + During active expiration, the respiratory muscles "compress" the IPS so IPP becomes +
Pneumothorax Air in a IPS, liquid seal breaks and lung collapse. Trauma: stab wound, volume trauma: diver who comes up to fast w/o exhaling. Spontaneous: Rupture of alveolus, common at apex. Tension: Air continues to come in



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