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Free download in PDF Breathing and Exchange of Gases Multiple Choice Questions (MCQs) and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
The function of pneumotoxic center is
[A]
to regulate inhalation
[B]
to maintain rhythmicity of respiration
[C]
increases rate of exhalation
[D]
does not play significant role
Answer: to regulate inhalation
(2)
The enzyme carbonic anhydrase is of which type?
[A]
lyases
[B]
reversible
[C]
isomerase
[D]
unidirectional
(3)
What is the role of buffer system in blood?
[A]
to maintain pH of blood plasma
[B]
to maintain pH of blood
[C]
to maintain pH of RBC
[D]
to maintain pH of blood platelets
Answer: to maintain pH of blood
(4)
Maximum amount of O2 is transported in humans by
[A]
RBC
[B]
WBC
[C]
blood platelets
[D]
blood plasma
(5)
Oxygen carrying capacity of blood is
[A]
20%
[B]
30%
[C]
40%
[D]
50%
(6)
Respiratory movements are controlled by
[A]
cerebellum
[B]
cerebrum
[C]
cruracerebri
[D]
medulla oblongata
Answer: medulla oblongata
(7)
Vital capacity of lung is equal to
[A]
IRV+ERV+TV
[B]
IRV+ERV+TV-RV
[C]
IRV+ERV+TV+RV
[D]
IRV+ERV
(8)
Vocal cords occur in
[A]
bronchial tube
[B]
glottis
[C]
pharynx
[D]
larynx
(9)
The cells which do not respire are
[A]
epidermal cells
[B]
sieve cells
[C]
cortical cells
[D]
erythrocytes
(10)
Which lungs are situated in the human body
[A]
abdominal cavity
[B]
thoracic cavity
[C]
coelomic cavity
[D]
pleural cavity
(11)
Which is the last step involved in respiration
[A]
diffusion of gases
[B]
breathing
[C]
utilisation of 02, by body cells and resultant release of CO2
[D]
transport of gases
Answer: utilisation of 02, by body cells and resultant release of CO2
(12)
The breathing rate of normal healthy man is
[A]
8-18 times/min
[B]
6-12 times/min
[C]
16-24 times/min
[D]
12-16 times/min
(13)
What is the value of tidal volume in a normal healthy man?
[A]
approximately 8000-12000 ml/min
[B]
1000-1100 ml/min
[C]
2500-3000 ml/min
[D]
approximately 6000-8000 ml/min
Answer: approximately 6000-8000 ml/min
(14)
What is the value of pCO2 in atmospheric air, alveoli and tissues respectively?
[A]
0.3 mm Hg,40 mm Hg, 95 mm Hg
[B]
95 mm Hg,40 mm Hg,159 mm Hg
[C]
45 mm Hg,0.3 mm Hg,40 mm Hg
[D]
0.3 mm Hg,40 mm Hg,45 mm Hg
Answer: 0.3 mm Hg,40 mm Hg,45 mm Hg
(15)
Which part of Hb,O2 molecules bind?
[A]
haem
[B]
globin
[C]
both A and B
[D]
amino group of globin
(16)
How much CO2 is delivered to the alveoli by every 100 ml of deoxygenated blood?
[A]
6 ml
[B]
4 ml
[C]
5 ml
[D]
3 ml
(17)
A pair of external nostrils present in human opens out
[A]
below the upper lips
[B]
above the upper lips
[C]
between upper and lower lips
[D]
above the rhythm
Answer: above the upper lips
(18)
Which instrument helps in clinical assessment of pulmonary functions?
[A]
sphygmomanometer
[B]
stethoscope
[C]
electrocardiograph
[D]
spirometer
(19)
Diaphragm is dome shaped muscular structure which separates
[A]
coelomic cavity from pelvic cavity
[B]
pleural cavity from thoracic cavity
[C]
thoracic cavity from abdominal cavity
[D]
pelvic cavity from abdominal cavity
Answer: thoracic cavity from abdominal cavity
(20)
What happens when pressure within the pulmonary cavity is higher then the atmosphere pressure?
[A]
inhalation of air
[B]
expulsion of air
[C]
no inhalation and expulsion of air occurs
[D]
lungs inhale and rupture
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