Author Question: What term is used to note the difference between inspiratory lung volume and expiratory lung volume ... (Read 62 times)

cmoore54 · **on:** Jul 16, 2018

What term is used to note the difference between inspiratory lung volume and expiratory lung volume at any given pressure?

a. Alveolar aphasia
b. Hysteresis
c. Pleural pressure variance
d. Transpulmonary pressures

Question 2

What forces must be overcome to move air into the respiratory system? 1. Tissue movement 2. Elastic forces of lung tissue 3. Airway resistance 4. Surface tension forces

a. 1, 2, and 3 only
b. 2 and 4 only
c. 4 only
d. 1, 2, 3, and 4

CourtneyCNorton · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: B
Deflation of the lung does not follow the inflation curve exactly. During deflation, lung volume at any given pressure is slightly greater than it is during inflation. This difference between the inflation and deflation curves is called hysteresis.

Answer to Question 2

ANS: D
Elastic forces involve the tissues of the lungs and thorax, along with surface tension in the alveo-li. Frictional forces include resistance caused by gas flow and tissue movement during breathing.