Pleural Pressure and Breathing (PK2)

Question 1

Changes of volume (V) during a breathing cycle

Answer 1

Increases from FRC to peak during inspiration, then back to FRC during expiration

Question 2

Changes of airflow (V̇) during a breathing cycle

Answer 2

Becomes negative during inspiration, then positive during expiration (starting and ending at 0)

Question 3

What is recoil pressure?

Answer 3

Tendency for the lung to collapse

Question 4

Changes of recoil pressure (Pel) during a breathing cycle

Answer 4

Becomes more positive during inspiration, then returns during expiration (still positive)

Question 5

Changes of alveolar pressure (PA) during a breathing cycle

Answer 5

Becomes negative during inspiration, then positive during expiration (starts and ends at 0)

Question 6

Changes of intrapleural pressure (Ppl) during a breathing cycle

Answer 6

Becomes more negative during inspiration, then more positive during expiration (always negative)