Chapter 11 Gas Exchange and Transport

Chapter 11  Gas Exchange and Transport

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. On what does the movement of gases between the lungs and the body tissues mainly depend?
a.
active transport
b.
gaseous diffusion
c.
membrane dialysis
d.
membrane transport

ANS: B
Gas movement between the lungs and tissues occurs by simple diffusion.

DIF: Application REF: p. 249 OBJ: 1

2. The lowest PO2 would normally be found in what location?
a.
arterial blood
b.
atmospheric air
c.
cells
d.
venous blood

ANS: C
The intracellular PO2 (approximately 5 mm Hg) provides the final gradient for oxygen diffusion into the cell.

DIF: Application REF: p. 249 OBJ: 1

3. The highest PCO2 levels are found in what location?
a.
arterial blood
b.
atmospheric air
c.
cells
d.
venous blood

ANS: C
The partial pressure of carbon dioxide (PCO2) is highest in the cells (approximately 60 mm Hg).

DIF: Application REF: p. 249 OBJ: 1

4. Which of the following are true regarding the PACO2?
1. directly proportional to whole-body carbon dioxide production
2. inversely proportional to alveolar ventilation (A)
3. normally maintained at about 35 to 45 mm Hg
a.
2 and 3
b.
1, 2, and 3
c.
1 and 2
d.
1 and 3

ANS: B
PACO2 varies directly with the body’s production of carbon dioxide (CO2) and inversely with alveolar ventilation (A). Under normal conditions it is maintained at about 35 to 45 mm Hg.

DIF: Application REF: p. 249 OBJ: 2

5. What is the approximate normal level of carbon dioxide production (CO2) for an adult?
a.
200 ml/min
b.
250 ml/min
c.
4200 ml/min
d.
6000 ml/min

ANS: A
In a healthy individual the normal CO2 of is about 200 ml/min.

DIF: Recall REF: p. 249 OBJ: 2