Chapter 10 Ventilation

Chapter 10  Ventilation

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. 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)

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

DIF: Application REF: p. 223 OBJ: 1

2. During each cycle of normal resting ventilation, a volume of gas is moved into and out of the respiratory tract. This cyclical volume is called the:
a.
inspiratory reserve volume (IRV)
b.
vital capacity (VC)
c.
residual volume (RV)
d.
tidal volume (VT)

ANS: D
During each cycle, a volume of gas moves in and out of the respiratory tract. This volume, measured during either inspiration or expiration, is called the tidal volume, or VT.

DIF: Application REF: p. 224 OBJ: 1

3. 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
c.
2 and 4
d.
1 and 4

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

DIF: Application REF: p. 225 OBJ: 2

4. Which of the following pressures normally remains negative (relative to atmospheric pressure) during quiet breathing?
a.
Palv
b.
Ppl
c.
Pao
d.
Pbs

ANS: B
Pleural pressure (Ppl) is usually negative (i.e., subatmospheric) during quiet breathing.

DIF: Application REF: p. 225 OBJ: 2

5. Which of the following pressure gradients is responsible for the actual flow of gas into and out of the lungs during breathing?
a.
transcanadian pressure gradient (Ppc – Pks)
b.
transpulmonary pressure gradient (Palv – Ppl)
c.
transrespiratory pressure gradient (Palv – Pao)
d.
transthoracic pressure gradient (Ppl – Pbs)

ANS: C
The transrespiratory pressure gradient causes gas to flow into and out of the alveoli during breathing.

DIF: Application REF: p. 225 OBJ: 2