Respiratory mcq 2

Question 1

Air moves out of the lungs because
A) the gas pressure in the lungs is less than outside pressure.
B) the volume of the lungs decreases with expiration.
C) the thorax is muscular.
D) contraction of the diaphragm increases the volume of the pleural cavity.
E) All of the answers are correct.
B) the volume of the lungs decreases with expiration.
22
In quiet breathing,
A) inspiration and expiration involve muscular contractions.
B) inspiration is passive and expiration involves muscular contractions.
C) inspiration involves muscular contractions and expiration is passive.
D) inspiration and expiration are both passive processes.
E) None of the answers are correct.
C) inspiration involves muscular contractions and expiration is passive.
23
Boyle’s law states that gas volume is
A) directly proportional to pressure.
B) directly proportional to temperature.
C) inversely proportional to pressure.
D) inversely proportional to temperature.
E) None of the answers are correct.
C) inversely proportional to pressure.
24
Air entering the body is filtered, warmed, and humidified by the
A) upper respiratory tract.
B) lower respiratory tract.
C) lungs.
D) alveoli.
E) All of the answers are correct.
A) upper respiratory tract.
25
A typical value for intrapleural pressure is ________ mm Hg.
A) +6
B) +3
C) 0
D) -3
E) -6
D) -3
26
According to the law of LaPlace, when comparing two alveoli lined with fluid, pressure in the one with the ________ diameter will be greater.
A) larger
B) smaller
B) smaller
27
When alveolar pressure is equal to atmospheric pressure, air flows into the lungs.
A) True
B) False
B) False
28
Active expiration is produced by contraction of
A) abdominal muscles only.
B) diaphragm only.
C) internal intercostals only.
D) external intercostals only.
E) abdominal muscles and internal intercostals.
E) abdominal muscles and internal intercostals.
29
When the diaphragm and external intercostal muscles contract,
A) expiration occurs.
B) intrapulmonary pressure increases.
C) intrapleural pressure decreases.
D) the volume of the lungs decreases.
E) All of the answers are correct.
C) intrapleural pressure decreases.
30
If a student inhales as deeply as possible and then blows the air out until he cannot exhale any more, the amount of air that he expelled is his
A) tidal volume.
B) inspiratory reserve volume.
C) expiratory reserve volume.
D) minimal volume.
E) vital capacity.
E) vital capacity.
31
Total cross-sectional area ________ with each division of the airways.
A) increases
B) decreases
C) does not change
A) increases
32
Blood vessels cover approximately ________% of the alveolar surface.
A) 80-90
B) 10-20
C) > 90
D) < 10
E) 50
A) 80-90
33
In the lungs, the
A) blood flow rate is higher and the blood pressure is lower, respectively, than the blood flow rate and the blood pressure in other tissues.
B) blood flow rate is higher and the blood pressure is higher, respectively, than the blood flow rate and the blood pressure in other tissues.
C) blood flow rate is lower and the blood pressure is lower, respectively, than the blood flow rate and the blood pressure in other tissues.
D) blood flow rate is lower and the blood pressure is higher, respectively, than the blood flow rate and the blood pressure in other tissues.
E) blood flow rate and the blood pressure are the same as in other tissues.
A) blood flow rate is higher and the blood pressure is lower, respectively, than the blood flow rate and the blood pressure in other tissues.
34
The distance between the alveolar airspace and capillary endothelium is ________, allowing gases to diffuse ________ between them.
A) short, rapidly
B) long, rapidly
C) short, slowly
D) long, slowly
E) None of the answers are correct–distance does not affect diffusion rate.
A) short, rapidly
35
Flow of air
A) is directly proportional to a pressure gradient, and flow decreases as the resistance of the system increases.
B) is directly proportional to the resistance, and flow decreases as the pressure of the system increases.
C) is directly proportional to a pressure gradient, and flow increases as the resistance of the system increases.
D) is directly proportional to the resistance, and flow increases as the resistance of the system increases.
E) None of the answers are correct.
A) is directly proportional to a pressure gradient, and flow decreases as the resistance of the system increases.
36
An increase in PCO2 would cause
A) the bronchioles to dilate and the systemic arterioles to dilate.
B) the bronchioles to dilate and the systemic arterioles to constrict.
C) the bronchioles to constrict and the systemic arterioles to dilate.
D) the bronchioles to constrict and the systemic arterioles to constrict.
E) None of the answers are correct.
A) the bronchioles to dilate and the systemic arterioles to dilate.
37
Chronic inhalation of fine particles that reach the alveoli leads to ________ lung disease.
A) obstructive
B) restrictive
C) fibrotic
D) compliant
E) congestive
C) fibrotic
38
Poiseuille’s law is summarized this way:
A) PV = nRT
B) R Lη/r4
C) P = 2T/r
D) P1V1 = P2V2
B) R Lη/r4
39
Histamine’s primary role in the respiratory system is as a
A) surfactant.
B) bronchodilator.
C) bronchoconstrictor.
D) vasodilator.
E) vasoconstrictor.
C) bronchoconstrictor.
40
the additional air inhaled after a normal inspiration
inspiratory reserve volume

Answer 1

Answered