Select all that are true concerning pressure changes during quite breathing. 1.

Question

Select all that are true concerning pressure changes during quite breathing.

1. When the intapleural pressure is held constant at its most negative pressure, air is continuing to flow into the lungs.

2. only when the pleural pressure is changing is the alveolar pressure not equal to 0 mm Hg.

3. The pressure inside the lungs is equal to atm. pressure when the intrapleural is at its highest.

4. The pressure inside the lungs is equal to atm. pressure when the intrapleural is at its lowest.

p.s. : this is the exact question that is being asked. I did not make any typing mistake.

Inspiration Expiration Inspiration Expiration +2 Alveolar pressure +1 (mm Hg) Intrapleural (mm Hg) 750 Volume of air moved 500 (mL) 250 Time (sec) Normally expiration takes 2-3 times longer than inspiration (not shown to scale on this idealized graph)

Explanation / Answer

The following statements are true

1 When the intapleural pressure is held constant at its most negative pressure, air is continuing to flow into the lungs.

4.The pressure inside the lungs is equal to atm. pressure when the intrapleural is at its lowest

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