Select all that are TRUE concerning pressure changes during quite breathing Insp

Question

Select all that are TRUE concerning pressure changes during quite breathing Inspiration Expiration InspirationExpiration pressure (mm Hg) At Intrapleural B3 Bpressure (mm Hg) B2 750 Volume moved mL 500 250 C1 2 3 4 5678 Time (sec) Normally expiration takes 2-3 times longer than inspiration (not shown to scale on this idealized graph). Fig. 17.9 Only when the pleural pressure is changing is the alveolar pressure not equal to 0 mm Hg The pressure inside the lungs is equal to atmospheric pressure when the intrapleural pressure is at its lowest Answers: When the intaplural pressure is held constant at its most negative pressure, air is continuing to flow into the lungs. Only when the pleural pressure is changing is the alveolar pressure not equal to 0 mm Hg The pressure inside the lungs is equal to atmospheric pressure when the intrapleural pressure is at its highest The pressure inside the lungs is equal to atmospheric pressure when the intrapleural pressure is at its lowest

Explanation / Answer

1; Only when the pleural pressure is changing the alveolar pressure not equal to zero; this statement is true because

2 The pressure inside the lungs is equal to atmospheric pressure when the intrapleural pressure is at its lowest, this statement is true

3; When the intrapleural pressure is held constant at its most negative pressure, air is continuinh to flow into the lungs, this statement is true

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