Breathing and Exchange of Gases MCQs | Breathing and Exchange of Gases Multiple Choice Questions (MCQs) and Answers

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Questions
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

Answer:reversible
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

Answer: RBC
5 Oxygen carrying capacity of blood is
A 20%
B 30%
C 40%
D 50%

Answer: 20%
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

Answer:IRV+ERV+TV
8 Vocal cords occur in
A bronchial tube
B glottis
C pharynx
D larynx

Answer:larynx
9 The cells which do not respire are
A epidermal cells
B sieve cells
C cortical cells
D erythrocytes

Answer:erythrocytes
10 Which lungs are situated in the human body
A abdominal cavity
B thoracic cavity
C coelomic cavity
D pleural cavity

Answer: thoracic 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

Answer: 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

Answer: haem
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

Answer:4 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

Answer: 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

Answer: expulsion of air

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