Lungs have inherent tendency to collapse (shrink) due to... A. collagenous fiber

Question

Lungs have inherent tendency to collapse (shrink) due to...

A. collagenous fibers in their stroma

B. the surface tenstion of the thin layer of fluid (mostley water) lining each pulmonary alveolus

C. atmospheric pressure (about 14 lbs per square inch) against the external aspect of the thoratic wall

D. contraction of the diaphragm

E. Intercostal muscles

#2--A bullett passed trasversely through the thorax from left to right, penetrating both lungs and the heart on the way. This bullet must have penetrated pericardium at least __ times and visceral (pulmonary) pleura at least ___ times.

A. 2-4

B. 4-4

C. 2-8

D. 4-8

E. 4-6

Explanation / Answer

1. B. The surface tension of thin layer of fluid.

2. B). 4 - 4

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