Breathing and Exchange of Gases MCQs | Breathing and Exchange of Gases Objective Type Questions with Answers

Questions
1 How much percent of CO2 is expired?
A 7%
B 32%
C 25%
D 20%

Answer:32%
2 When CO2 concentration in blood increased breathing becomes ____________
A shallower and deeper
B slow and deep
C faster and deeper
D no effect on breathing

Answer:faster and deeper
3 The oxygen toxicity is related to _________
A Blood poisoning
B Failure of ventilation of lungs
C Collapsing of the alveolar wall
D Improper functioning of alveoli

Answer: Failure of ventilation of lungs
4 Carbon dioxide cannot be transported with hemoglobin.
A True
B False

Answer:False
5 After deep inspiration maximum expiration of lungs is called ________
A Vital capacity
B Total lung capacity
C Inspiratory capacity
D Functional residual capacity

Answer:Vital capacity
6 Pulmonary ventilation movements are due to __________
A Costal muscles and diaphragm
B Diaphragm
C Wall of lungs
D Costal muscles

Answer: Costal muscles and diaphragm
7 If RQ is 0.6 in a respiratory metabolism it would mean that _________
A Carbohydrate is used as respiratory substrate
B Organic acids are used as respiratory substrate
C Oxidation of respiratory substrate consumed more O2 than CO2 produced
D Reaction is anaerobic

Answer: Oxidation of respiratory substrate consumed more O2 than CO2 produced
8 Partial pressure of oxygen in lungs is ____________
A 60 mm Hg
B 40 mm Hg
C 110 mm Hg
D 100 mm Hg

Answer:100 mm Hg
9 Vital capacity of lung is __________
A TV+IRV+ERV
B TV+IRV+RV
C TV+ERV
D IRV+ERV

Answer: TV+IRV+ERV
10 Hamburger shift is also known as ___________
A Bicarbonate shift
B Chloride shift
C Potassium shift
D Sodium shift

Answer: Chloride shift
11 Amount of CO2 in expired air is _________
A 0.04%
B 0.03%
C 3.6%
D 21%

Answer: 3.6%
12 Dead space air in man is __________
A 500ml
B 150ml
C 250ml
D None of these

Answer:150ml
13 Total lung capacity is _____________
A 5000-6000ml
B 2500-5000ml
C 4000-5500ml
D 3000-6000ml

Answer: 5000-6000ml
14 Which is true for carbon dioxide concentration?
A More in alveolar air than in expired air
B More in inspired air than in alveolar air
C More in expired air than in alveolar air
D More in alveolar air than in inspired air

Answer:More in alveolar air than in expired air
15 One molecule of hemoglobin carries ___________ molecules of oxygen.
A 1
B 2
C 3
D 4

Answer: 4
16 Maximum amount of oxygen is exchanged from blood in ___________
A Arteries of the body
B Capillaries surrounding the alveoli
C Left auricle of the heart
D Arteries of the body

Answer:Capillaries surrounding the alveoli
17 Residual volume is _______________
A Lesser than tidal volume
B Greater than vital capacity
C Greater than inspiratory volume
D Greater than tidal volume

Answer: Greater than tidal volume
18 Oxygen dissociation curve is _________
A Parabolic
B Hyperbolic
C Sigmoid
D Straight

Answer:Sigmoid
19 RQ is one in case of ____________
A Fatty acids
B Nucleic acids
C Organic acids
D Carbohydrates

Answer:Carbohydrates
20 Oxygen is mainly transported as ____________
A Oxyhemoglobin
B Hemo-oxyglobin
C Hemoglobin
D Oxynoglobin

Answer: Oxyhemoglobin
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