Which of the following pressures vary throughout the normal ...

[K@]

Which of the following pressures vary throughout the normal breathing cycle? 1. Alveolar pressure (Palv) 2. Body surface pressure (Pbs) 3. Mouth pressure (Pao) 4. Pleural pressure (Ppl)
 
  a. 1, 2, 3, and 4
  b. 2, 3, and 4 only
  c. 2 and 4 only
  d. 1 and 4 only

Question 2

What is the primary function of the lungs?
 
  a. Convert angiotensin I to angiotensin II.
  b. Filter pulmonary blood.
  c. Gas exchange.
  d. Remove carbon monoxide (CO).

[marict]

Answer to Question 1

ANS: D
Alveolar pressure (Palv), often referred to as intrapulmonary pressure, varies during the breathing cycle. Ppl also varies during the breathing cycle.

Answer to Question 2

ANS: C
The primary functions of the lungs are to supply the body with oxygen (O2) and to remove car-bon dioxide (CO2).