PNB 2265 EXAM 2 QUESTIONS AND ANSWERS SCORED
A+
Lung surfactant...
a. increases water tension at the alveoli
b. decreases gas exchange at the alveoli
c. acts as an expanding force
d. acts as a collapsing force
e. is made up of solely proteins Answer - c. acts as an expanding force
Breathing...
a. is an autonomic act
b. requires activation of skeletal muscles under the regulation of the vagal
nerve
c. is rhythmic
d. cannot be modified by cortex inputs
e. all of the above Answer - c. is rhythmic
When the diaphragm contracts...
a. air enters the alveoli
b. intrapulmonary (alveolar) pressure increases
c. intrapleural pressure increases
d. pulmonary arterioles constrict Answer - a. air enters the alveoli
,Bicarbonate ions are...
a. generated by dissociation of carbonic acid (H2CO3)
b. found in the venous and arterial blood
c. produced by erythrocytes
d. the major way CO2 is transported into the blood
e. all of the above Answer - e. all of the above
The conducting zone includes all except which of the following structures?
a. ciliated epithelium
b. respiratory bronchioles
c. tertiary bronchi
d. trachea
e. nasal cavity Answer - b. respiratory bronchioles
Paralysis of the intracostal and scalene muscles would affect...
a. forced expiration
b. quiet inspiration
c. quiet expiration
d. forced inspiration
e. none of the above Answer - d. forced inspiration
Which of the following decreases lung volume?
a. relaxing the intercostal and scalene muscles
b. contracting the diaphragm
c. relaxing abdominal muscles
, d. adding surfactant to the lung
e. contracting abdominal muscles Answer - e. contracting abdominal muscles
Why does pneumonia, which causes fluid accumulation in the lungs, decrease
gas exchange with the body?
a. because it causes the respiratory membrane to thicken
b. because it causes the alveoli to become larger
c. because it causes bronchodialation
d. because it causes the respiratory membrane to thin
e. because it causes terminal bronchiole dilation Answer - a. because it causes
the respiratory membrane to thicken
Why does air enter the lungs during inhalation?
a. because the bronchioles vasodiolate during each inhalation
b. because air pressure inside the alveoli is less than atmospheric air pressure
c. because intra-pleural pressure exceeds the elastic recoil of the lungs
d. because the intra-pleural pressure equals the elastic recoil of the lungs
e. because the air pressure inside the alveoli is greater than the atmospheric
air pressure Answer - b. because air pressure inside the alveoli is less than
atmospheric air pressure
A V/Q> 0.8 might mean...
a. a patient might has decreased ventilation
b. a patient may have increased ventilation
c. blood flow to the lungs may be decreased
d. your patient likely has congestive heart failure
e. both b and c Answer - e. both b and c
A+
Lung surfactant...
a. increases water tension at the alveoli
b. decreases gas exchange at the alveoli
c. acts as an expanding force
d. acts as a collapsing force
e. is made up of solely proteins Answer - c. acts as an expanding force
Breathing...
a. is an autonomic act
b. requires activation of skeletal muscles under the regulation of the vagal
nerve
c. is rhythmic
d. cannot be modified by cortex inputs
e. all of the above Answer - c. is rhythmic
When the diaphragm contracts...
a. air enters the alveoli
b. intrapulmonary (alveolar) pressure increases
c. intrapleural pressure increases
d. pulmonary arterioles constrict Answer - a. air enters the alveoli
,Bicarbonate ions are...
a. generated by dissociation of carbonic acid (H2CO3)
b. found in the venous and arterial blood
c. produced by erythrocytes
d. the major way CO2 is transported into the blood
e. all of the above Answer - e. all of the above
The conducting zone includes all except which of the following structures?
a. ciliated epithelium
b. respiratory bronchioles
c. tertiary bronchi
d. trachea
e. nasal cavity Answer - b. respiratory bronchioles
Paralysis of the intracostal and scalene muscles would affect...
a. forced expiration
b. quiet inspiration
c. quiet expiration
d. forced inspiration
e. none of the above Answer - d. forced inspiration
Which of the following decreases lung volume?
a. relaxing the intercostal and scalene muscles
b. contracting the diaphragm
c. relaxing abdominal muscles
, d. adding surfactant to the lung
e. contracting abdominal muscles Answer - e. contracting abdominal muscles
Why does pneumonia, which causes fluid accumulation in the lungs, decrease
gas exchange with the body?
a. because it causes the respiratory membrane to thicken
b. because it causes the alveoli to become larger
c. because it causes bronchodialation
d. because it causes the respiratory membrane to thin
e. because it causes terminal bronchiole dilation Answer - a. because it causes
the respiratory membrane to thicken
Why does air enter the lungs during inhalation?
a. because the bronchioles vasodiolate during each inhalation
b. because air pressure inside the alveoli is less than atmospheric air pressure
c. because intra-pleural pressure exceeds the elastic recoil of the lungs
d. because the intra-pleural pressure equals the elastic recoil of the lungs
e. because the air pressure inside the alveoli is greater than the atmospheric
air pressure Answer - b. because air pressure inside the alveoli is less than
atmospheric air pressure
A V/Q> 0.8 might mean...
a. a patient might has decreased ventilation
b. a patient may have increased ventilation
c. blood flow to the lungs may be decreased
d. your patient likely has congestive heart failure
e. both b and c Answer - e. both b and c
