(a) cellular respiration
(b) breathing
(c) ventilation
(d) perfusion
2. The harmful gas produced by catabolic reaction in our body is
(a) oxygen
(b) carbondioxide
(c) phosphine
(d) ozone
3. Oxygen (O2) is utilized by the organisms to __________ break down nutrient molecules like glucose and to derive energy for performing various activities.
(a) directly
(b) indirectly
(c) incompletely
(d) any of the these
4. Mechanisms of breathing vary among diff erent groups of animals depending mainly on their
________ and _________.
(a) habitats (b) levels of organization
(c) both (a) and (b) (d) None
5. In which of the following, gaseous exchange between O2
and CO2
occurs through the entire
body surface?
(a) Sponges (b) Flatworms (c) Coelenterates (d) All
6. Select the total number of organism from the following which respire through their body
surface.
Sycon, Spongilla, Admsia, Taenia, Laccifer, Pila, Antedon, Gorgonia, Jelly fi sh
(a) 4 (b) 5 (c) 6 (d) 8
7. In which of the following skin serves as an accessory organ of respiration?
(a) Rabbit (b) Frog (c) Lizards (d) Birds
8. Match the following:
Animals Respiratory Organs
A. Earthworms – 1. Lungs
B. Aquatic arthropods/Molluscs – 2. Tracheal tubes
C. Insects – 3. Gills
D. Birds/ Reptiles/Mammals – 4. Moist cuticle
E. Fishes
(a) A–2, B and C–3, D–2, E–4 (b) A–4, B and E–3, C–2, D–1
(c) A–4, B and D–3, D–1, E–2 (d) A–3, B and D–1, C–2, E–4
9. Amphibians, e.g. frogs respire through
(a) moist skin (b) lungs (c) Buccopharyhgeal cavity (d) All
10. The adult frog does not respire through
(a) buccopharyngeal cavity (b) gills
(c) skin (d) lungs
11. Which is the correct sequence of the air passage in man?
(a) Nasal cavity → pharynx → trachea → larynx → bronchi → bronchioles → alveoli
(b) Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles → alveoli
(c) Nasal cavity → larynx → pharynx → trachea → bronchi → bronchioles → alveoli
(d) Nasal cavity → larynx → bronchi → pharynx → trachea → bronchioles → alveoli
12. In mammal, voice is produced by
(a) Bronchus (b) Syrinx
(c) Larynx (d) Inhalation and exhalation
13. Vocal cords occur in
(a) Pharynx (b) Larynx
(c) Glottis (d) Bronchial tube
14. Trachea divides into right and left primary bronchi at _________ the thoracic vertebra.
(a) 4 (b) 5 (c) 6 (d) 9
15. Opening of larynx into pharynx is guarded by
(a) Syrinx (b) Epiglottis (c) Tracheal valves (d) All
16. Glottis is a passage for
(a) food (b) air
(c) both (d) none
17. Glottis is an opening in the fl oor of
(a) mouth (b) trachea (c) pharynx (d) diaphragm
18. Which one protects the lungs?
(a) Ribs (b) Vertebral column
(c) Sternum (d) All
19. Which one has the smallest diameter?
(a) Right bronchus (b) Left bronchus
(c) Secondary bronchiole (d) Respiratory bronchiole
20. Lining of trachea is made of
(a) Simple squamous epithelium (b) Simple cuboidal epithelium
(c) Pseudostratifi ed epithelium (d) Stratifi ed cuboidal epithelium
21. Each terminal bronchiole gives rise to a number of very thin, irregular-walled and vascularized
bag-like structures called
(a) alveoli (b) respiratory bronchioles
(c) pleura (d) follicles
22. Epiglottis is made up of
(a) fi brous cartilage (b) hyaline cartilage
(c) elastic cartilage (d) calcifi ed cartilage
23. Covering of the lungs is called
(a) Perichondrium (b) Pleural membrane
(c) Pericardium (d) Peritoneum
24. Read the following statements:
A. It is double layered and covers and lungs
B. Outer layer is in contact with thoracic wall
C. Fluid is present between these layers
D. Inner layer is in contact with lungs
The above features refer to
(a) pericardium (b) peritoneum
(c) perichondrium (d) pleura
25. The part starting with the external nostrils up to the terminal bronchioles constitute the
(a) respiratory of respiratory system (b) exchange part of respiratory system
(c) expiratory part (d) conducting part of respiratory system
26. Respiratory or exchange part of the respiratory system consists of
(a) all bronchi
(b) all bronchioles
(c) all bronchi and terminal bronchioles
(d) alveoli and their ducts
27. Sites of gaseous exchange in lungs are
(a) alveoli (b) bronchi (c) bronchioles (d) pleura
28. Pleura is double membrane sac which envelops
(a) Kidneys (b) Brain (c) Lungs (d) Nasal passage
29. Following are functions of conducting part of the respiratory system except
(a) removal of foreign particles from incoming air
(b) humidifi es incoming air
(c) bring the temperature of incoming air to body temperature
(d) all
30. ___________ is the site of actual diff usion of O2
and CO2
between blood and atmospheric air.
(a) All bronchi
(b) All bronchioles
(c) All bronchi and terminal bronchioles
(d) Alveoli and their ducts
31. Even when air being absent, human trachea does not collapse due to the presence of
(a) bony rings (b) turgid pressure
(c) chitinous rings (d) cartilaginous rings
32. The chambers formed dorsally by the vertebral column, ventrally by sternum, laterally by ribs
and on the lower side by dome-shaped diaphragm is
(a) abdominal chamber (b) cranial chamber
(c) pelvic chamber (d) thoracic chamber
33. Select the incorrect statement from the following:
(a) Pleural fl uid reduces friction on the lung surface
(b) The anatomical setup of lungs in thorax is such that any change in the volume of the
thoracic cavity will be refl ected in the lung (pulmonary) cavity. Such an arrangement is
essential for breathing, as we cannot directly alter the pulmonary volume
(c) The tracheae, primary, secondary and tertiary bronchi, and initial bronchioles are
supported by complete cartilaginous rings.
(d) During swallowing glottis can be covered by a thin elastic cartilaginous fl ap called
epiglottis to prevent the entry of food into the larynx.
34. During inspiration
(a) Diaphragm and external intercostals muscle relax
(b) Diaphragm and internal intercostals muscles relax
(c) Diaphragm and external intercostals muscles contract
(d) Diaphragm and internal intercostals muscles contract
35. During inspiration, the diaphragm
(a) relaxes to become dome-shaped (b) contracts and fl attens
(c) expands (d) shows no change
36. Expiration involves
(a) Relaxation of diaphragm and intercostals muscles
(b) Contraction of diaphragm and intercostals muscles
(c) Contraction of diaphragm muscles
(d) Contraction of intercostals muscles
37. Which two of the following changes (a–d) usually tend to occur in plain dwellers when they
move to higher altitudes (3500 m or more)
(i) Increase in red blood cell size (ii) Increase in red blood cell production
(iii) Increase in breathing rate (iv) Increase in thrombocyte count:
(a) both (iii) and (iv) (b) both (i) and (iv) (c) both (iii) and (ii) (d) both (ii) and (iii)
38. In alveolar air, partial pressure of CO2
is:
(a) 40 mm Hg (b) 44 mm Hg
(c) 46 mm Hg (d) 42 mm Hg
39. Arrange the following steps of respiration properly:
1. Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2
rich
alveolar air is released out
2. Diff usion of gases (O2
and CO2
) across alveolar membrane
3. Transport of gases by the blood
4. Diff usion of O2
and CO2
between blood and tissues
5. Utilization of O2
, by the cells for catabolic reactions and resultant release of CO2
(a) 1,2,3,4,5 (b) 1,3,2,5,4 (c) 5,4,3,1,2 (d) 3,4,5,2,1
40. Expiratory muscles contract at the time of
(a) Deep inspiration (b) Normal inspiration and expiration
(c) Forceful expiration (d) Muscular expansion of lungs
41. Which of the following statements is correct?
(a) Inspiration is an active process
(b) Inspiration is a passive process
(c) Expiration is an active process
(d) Both expiration and inspiration are passive processes
42. Gaseous exchange between blood and alveolar air across respiratory membrane occurs by:
(a) osmosis (b) diff usion
(c) active transport (d) phagocytosis
43. On an average, a healthy human breathes how many times/minute
(a) 20−40 (b) 72−75 (c) 3−5 (d) 12−16
44. We can increase the strength of inspiration and expiration by the help of additional muscle in
(a) Abdomen (b) Neck (c) Pelvis (d) Head
45. Match the following:
1. Tidal volume – A. Tidal volume and inspiratory reserve
volume and expiratory reserve volume
2. Inspiratory reserve volume – B. Additional volume of air a person can
inspire by a forcible inspiration.
3. Expiratory reserve volume – C. Volume of air remaining in the lungs
even after a forcible expiration
4. Residual volume – D. Tidal volume and inspiratory reserve
volume
5. Inspiratory reserve Capacity – E. Volume of air inspired or expired during
a normal respiration.
6. Vital capacity – F. Vital capacity + residual volume
7. Total lung Capacity – G. Additional volume of air a person can
expire by a forcible expiration.
(a) 1–E, 2–C, 3–B, 4–G, 5–D, 6–A, 7–F
(b) 1–E, 2–G, 3–B, 4–C, 5–A, 6–D,7–F
(c) 1–E, 2–C, 3–G, 4–B, 5–D, 6–A,7–F
(d) 1–E,2–B, 3–E, 4–C, 5–D, 6–A, 7–F
46. Match the following:
1. Tidal Volume – A. 2500−3000 ml of air
2. Inspiratory reserve volume – B. 1000−1100 ml of air
3. Expiratory reserve volume – C. 500 ml of air
4. Residual volume – D. 3500−4600 ml of air
5. Vital capacity – E. 1100−1200 ml of air
(a) 1−C, 2−D, 3−B, 4−A, 5−E (b) 1−C, 2−A, 3−B, 4−E, 5−D
(c) 1−C, 2−A, 3−D, 4−E, 5−B (d) 1−E, 2−A, 3−B, 4−E, 5−D
47. Total lung capacity is equal to
(a) ERV + TV (b) IRV+ TV
(c) VC + RV (d) ERV + TV + IRV
48. Vital capacity is equal to
(a) ERV + TV (b) IRV+ TV
(c) VC + RV (d) ERV + TV + IRV
49. EC (expiratory capacity) is equal to
(a) ERV + TV (b) IRV+ TV
(c) VC + RV (d) ERV + TV + IRV
50. IC (Inspiratory capacity) is equal to
(a) ERV + TV (b) IRV+ TV
(c) VC + RV (d) ERV + TV + IRV
51. Arrange the following in order of increasing volume
1. Tidal volume 2. Residual volume
3. Expiratory reserve volume 4. Inspiratory reserve volume
(a) 1< 2<3<4 (b) 1<4<3<2 (c) 1<3<2<4 (d) 1<4<2<3
52. The largest quantity of air that can be expired after a maximum inspiratory eff ort is
(a) residual volume (b) tidal volume
(c) vital capacity (d) total lung volume
53. The vital capacity of adult human lungs is equal to
(a) the maximum volume of air a person can breathe out after a forced inspiration
(b) the maximum volume of air a person can breathe in after a forced expiration
(c) ERV + TV + IRV
(d) all
54. Functional residual capacity can be represented as
(a) TV + ERV (b) ERV + RV (c) RV + IRV (d) ERV + TV + IRV
55. The volume of air involved in breathing movements can be estimated by using a ________
which helps in clinical assessment of pulmonary functions
(a) osmometer (b) potometer
(c) spirometer (d) sphygmomanometer
56. A spirometer cannot be used to measure
(a) IC (b) RV (c) ERV (d) IRV
57. Inspiratory air in lungs ultimately reaches
(a) trachea (b) alveoli (c) bronchi (d) bronchioles
58. Which is not true?
(a) pCO2
of deoxygenated blood is 95 mm Hg
(b) pCO2
of alveolar air is 40 mm Hg
(c) pO2
alveolar air is 104 mm Hg
(d) pO2
of oxygenated blood is 95 mm Hg
(e) pO2
of deoxygenated blood is 40 mm Hg
59. Which of the following factors aff ect the rate of diff usion of gases?
(a) Partial pressure/concentration gradient of diff using gases
(b) Solubility of gases
(c) Thickness of diff usion membrane
(d) All
60. Lung alveoli of mammals have a thin wall composed of
(a) simple cuboidal epithelium (b) simple squamous epithelium
(c) stratifi ed cuboidal epithelium (d) stratifi ed squamous epithelium
61. The mode of respiration in rabbit is
(a) cutaneous (b) mucosal (c) tracheal (d) pulmonary
62. Respiratory diff usion membrane is majorly made of _______ layers
(a) 2 (b) 3 (c) 4 (d) 5
63. The solubility of CO2 is _______ times higher than that of O2
(a) 10−15 (b) 20−25 (c) 30−35 times (d) 210 times
64. What is the value of [PO2
(in deoxygenated blood) minus PCO2
(in deoxygenated blood)]?
(a) 5 (b) −5 (c) 45 (d) 40
65. Select the incorrect statement from the following:
(a) Diff usion of O2
occurs from alveoli to tissue
(b) Diff usion of CO2 occurs from tissue to alveoli
(c) Amount of CO2
diff use through membrane is higher than that of O2
(d) Partial pressure of O2
is higher in pulmonary artery than that of pulmonary vein.
66. Total thickness of respiratory diff usion membrane is
(a) less than fm (b) less than micro meter.
(c) much less than mm (d) less than nm.
67. Diff usion membrane is made up of
(a) thin squamous epithelium of alveoli
(b) endothelium of alveolar capillaries
(c) basement membrane between the two layers
(d) all
68. Partial pressures (in mmHg) of O2
in atmospheric air, alveoli, deoxygenated blood,
oxygenated blood and tissues are
(a) 159,104,40,95,40 (b) 104,40,40,95,159
(c) 0.3,40,45,40,45 (d) 159,104,45,95,40
69. Partial pressure (in mmHg) of CO2
in atmospheric air, alveoli, deoxygenated blood,
oxygenated blood and tissues are
(a) 159,104,40,95,40 (b) 104,40,40,95,159
(c) 0.3,40,45,40,45 (d) 159,104,45,95,40
70. Total percentage of O2
transported by hemoglobin or RBC is
(a) 3% (b) 97% (c) 70% (d) 7%
71. Besides RBC blood plasma also carries O2
in dissolved state. The percentage is
(a) 3% (b) 97% (c) 70% (d) 7%
72. CO2 is transported
(a) by RBC (b) as bicarbonates
(c) in dissolved state through plasma (d) all
73. Blood entering the lung is rich in
(a) Oxygen (b) Carbon dioxide (c) Urea (d) More RBCs
74. The majority of CO2
is transported as
(a) carbonates (b) bicarbonates
(c) carbaminohaemoglobin (d) dissolved state in blood
75. Oxygen is transported in blood mainly by
(a) Blood plasma (b) Leucocytes (c) Thrombocytes (d) Erythrocytes
76. Blood transport of occurs CO2 in three forms. The correct percentages of CO2
in these forms are
As Carbaminohaemoglobin in RBC As bicarbonates Dissolved form in plasma
(a) 20−25 % 70% 7%
(b) 7% 20−25% 70%
(c) 20−25% 7% 70%
(d) 70% 20−25% 7%
77. Each molecule of hemoglobin can carry at the maximum _______ molecules of O2
(a) 1 (b) 2 (c) 3 (d) 4
78. Under a given oxygen concentration in blood, dissociation of oxyhaemoglobin will increase if
(a) pH of blood falls (b) pH of blood rises
(c) CO2
concentration in blood falls (d) Free fatty acid concentration in blood falls
79. The blood coming out of lungs is richer than that one entering into lungs in
(a) CO2
(b) O2
(c) Both (d) None
80. When partial pressure of CO2
(pCO2
) rises, the oxygen dissociation curve of hemoglobin at
37°
C will
(a) shift towards right (b) shift towards left
(c) become irregular (d) remain unchanged
81. Dissociation curve is connected with
(a) Myoglobin (b) CO (c) O2
(d) oxyhaemoglobin
82. A large proportion of oxygen is left unused in the human blood even after uptake by the body
tissue. This oxygen
(a) Is enough to keep oxyhaemoglobin saturation at 96%
(b) Helps in releasing more oxygen to epithelial tissues
(c) Acts as reserve during muscular exercise
(d) Raise pCO2
of blood to 75 mm Hg
83. Oxygen dissociation curve is
(a) parabola (b) sigmoid (c) hyperbola (d) straight line
84. Binding of oxygen with hemoglobin can be aff ected by
(a) pCO2
(b) H+ conc (c) Temperature (d) All
85. Amount of O2
normally carried by 100 ml, of pure blood
(a) 10 ml (b) 20 ml (c) 5 ml (d) 4 ml
86. How much oxygen is delivered to tissue by 100 ml of oxygenated blood under normal physio-
logical condition?
(a) 10 ml (b) 20 ml (c) 5 ml (d) 4 ml
87. How much carbon dioxide is delivered to alveoli by 100 ml of deoxygenated blood under
normal physiological condition?
(a) 10 ml (b) 20 ml (c) 5 ml (d) 4 ml
88. Oxygen binding to haemoglobin is
(a) Directly proportional to CO2
concentration
(b) Directly proportional to CO concentration
(c) Inversely proportional to CO2
concentration
(d) Independent of CO concentration
89. The most characteristic feature of haemoglobin is
(a) its red colour
(b) presence of iron
(c) its ability to combine reversibly with oxygen
(d) presence of basic protein globin
90. Factors at tissue level favours dissociation of oxygen from oxyhemoglobin
(a) low pO2
, low pCO2
, high H+
, low temperature
(b) high pO2
, high pCO2
, low H+
, high temperature
(c) low pO2
, high pCO2
, high H+
, high temperature
(d) low pO2
, high pCO2
, high H+
, low temperature
91. CO2
dissociates from Carbaminohaemoglobin when
(a) low PO2
, low PCO2
(b) high PO2
, high PCO2
(c) low PO2
, high PCO2 (d) high PO2
, low PCO2
92. Dissociation of oxyhaemoglobin can be promoted by
(a) Low pCO2
(b) High pCO2
(c) Low body temperature (d) High blood pH
93. Enzyme essential for transport of CO2
as bicarbonate in blood is:
(a) Carboxypeptidase (b) Succinic dehydrogenase
(c) Carbonic anhydrase (d) Thrombokinase
(e) Lactase
94. What is correct about human respiration?
(a) About 90% of CO2
is carried by haemoglobin as carbaminohaemoglobin
(b) Neural signals from pneumotaxic centre of pons can increase duration of inspiration
(c) Workers in grinding and stone breaking industries may suff er from lung fi brosis
(d) Cigarette smoking leads to infl ammation of bronchi
95. Choose the right sequential phenomena during passage of O2
from blood to tissues:
P) Absorption of CO2
by blood.
Q) Reaction of CO2
with water forming H2
CO3
inside RBCs and then and HCO3
ions H.
R) Reaction of CO2
with water forming H2
CO3
inside plasma followed by conversion into H+
and HCO3
ions.
S) Combination of H+ with haeme part of HbO2
to release O2
.
T) Combination of HCO3
with haeme part of HbO2
to form reduced haemoglobin and release
of O2
.
(a) P, R, S (b) P, Q, T (c) P, Q, S (d) P, R, T
96. The transport of CO2
by the blood in primarily dependent on the
(a) solubility of CO2
in blood
(b) presence of carbonic anhydrase in RBCs
(c) ability of hemoglobin to bind and transport CO2
(d) ability of other blood proteins
97. Pick the correct statement:
(a) Contraction of internal intercostals muscles lifts up the ribs and sternum
(b) RBCs transport oxygen only
(c) Thoracic cavity is anatomically an air tight chamber
(d) Healthy man can inspire approximately 500 mL of air per minute
(e) During expiration the interpleural pressure is slightly below the surrounding atmospheric
pressure
98. Respiratory rhythm centre is present in which part of brain?
(a) Pons (b) Medulla oblongata
(c) Cerebrum (d) Cerebellum
99. Pneumotaxic centre is present in
(a) pons (b) medulla oblongata
(c) cerebrum (d) cerebellum
100. Human beings have a signifi cant ability to maintain and moderate the respiratory rhythm to
suit the demands of the body tissues. This is done by
(a) endocrine system (b) neural system
(c) excretory system (d) all
101. A (1) _________ sensitive area is situated adjacent to the rhythm centre which is highly sensi-
tive to _________ (2) _and _ (3) _________ ions
(a) (1)–thermo, (2)–CO2
, (3)–hydroxide (b) (1)–chemo, (2)–O2
, (3)–hydroxide
(c) (1)–thigmo, (2)–O2
, (3)–hydrogen (d) (1)–chemo, (2)–CO2
, (3)–hydrogen
102. All of the following factors play role in the regulation of respiratory rhythm except
(a) CO2
(b) H+
conc (c) O2 (d) None of the above
103. Select the incorrect statement from the following:
(a) Neural signal from Pneumotaxic centre can reduce the duration of inspiration
(b) The role of oxygen in the regulation of respiratory rhythm is quite signifi cant
(c) RBCs contain a very high concentration of the enzyme, carbonic anhydrase and minute
quantities of the same is present in the plasma too
(d) CO2
is carried by haemoglobin as carbamino-haemoglobin (about 20–25 per cent)
104. Receptors associated with aortic and carotid artery can recognize changes in ______ and
_____ conc. and send necessary signal to _____ for remedial action.
(a) O2
, CO2
, pneumotaxic (b) CO2
, H+, rhythm centre
(c) CO2
,H+
, apneustic centre (d) O2
, H+
, pneumotaxic
105. Carbonic anhydrase is found in high concentration in
(a) leucocytes (b) blood plasma (c) erythrocytes (d) lymphocytes
106. Controlling centre of normal breathing in mammals lies in
(a) Cerebrum (b) Cerebellum
(c) Midbrain (d) Medulla oblongata
107. Number of RBCs per unit volume of blood is likely to be higher in a person living at high
altitudes, because
(a) air is clean and unpolluted (b) more sunshine is available
(c) air is less dense (d) vegetation gives out more O2
108. Wheezing sound is produced in
(a) Asthma (b) Emphysema (c) Silicosis (d) Pneumonia
109. Major cause of emphysema is
(a) cigarette smoking (b) allergy
(c) wine consumption (d) viral infection
110. Match the column:
Column A Column B
1. Asthma – A. Infl ammation of bronchi and bronchioles
2. Emphysema – B. Chronic disorder in which alveolar walls
are damaged due to which respiratory
surface is decreased
3. Occupational Respiratory Disorders – C. Long exposure of chemicals can give
rise to infl ammation leading to fi brosis
(proliferation of fi brous tissues)
(a) 1−A, 2−B, 3−C (b) 1−B, 2−A, 3−C (c) 1−C, 2−A, 3−B (d) 1−C, 2−B, 3−A
111. Emphysema is a
(a) Cardiovascular disease (b) Pulmonary disease
(c) Renal disease (d) Pain in lungs
112. Which of the following is incorrect about occupational respiratory disorder?
(a) It occur in some industries, especially those involving grinding or stone-breaking
(b) Long exposure in such industries leading to fi brosis (proliferation of fi brous tissues)
(c) Workers in such industries can be protected from these disorders by wearing protective
masks
(d) It is an allergic disease always
113. Respiratory control centre lies in
(a) pons (b) medulla oblongata
(c) both (d) cerebellum
114. Two friends are eating together in a dining table. One of them suddenly starts coughing while
swallowing some food. This coughing would have been due to the improper movement of
(a) tongue (b) epiglottis (c) diaphragm (d) neck
115. Which one of the following is a possibility for most of us in regard to breathing, by making a
conscious eff ort?
(a) One can breathe out air totally without oxygen
(b) One can breathe out air through Eustachian tubes by closing both the nose and the mouth
(c) One can consciously breathe out by moving the diaphragm alone without moving the ribs at all
(d) The lungs can be made fully empty by forcefully breathing out all air from them
116. Cartilaginous rings in respiratory passage are present in
(a) Trachea only (b) Trachea and initial bronchioles only
(c) Trachea, bronchi and initial bronchioles (d) None
117. Which of the following represents a larger volume of air than that is normally found in the
resting tidal volume or a human lung?
(a) Residual volume (b) Inspiratory reserve volume
(c) Expiratory reserve volume (d) All
118. Mark the correct statement from the following:
(a) Tracheal rings are of hyaline cartilage
(b) Dorsal side of thoracic chamber is formed by sternum
(c) Expiration occurs when there is negative pressure in lungs
(d) All
119. 6000−8000 ml of air is the
(a) vital capacity of lungs (b) volume of normal expiration per minute
(c) sum of IRV + ERV (d) inspiratory capacity of lungs
120. The volume of air that remains in the lungs after normal expiration is
(a) residual volume (b) vital capacity
(c) expiratory capacity (d) functional residual capacity
121. A large proportion of oxygen is left unused in the human blood even after its uptake by the
body tissues. This O2
(a) helps in releasing more O2
to the epithelium tissues
(b) acts as a reserve during muscular exercise
(c) raises the pCO2
of blood to 75 mm of Hg
(d) is enough to keep oxyhaemoglobin saturation at 96%
122. Bulk of carbon dioxide (CO2
) released from body tissues into blood is present as
(a) bicarbonate in blood plasma and RBCs
(b) free CO2
in blood plasma
(c) 70% Carbaminohaemoglobin and 30% as bicarbonate
(d) Carbaminohaemoglobin in RBCs
125. How O2
and CO2
gets transported through blood?
(a) with the help of RBCs and blood plasma
(b) with the help of RBCs and WBCs
(c) with the help of WBCs and blood serum
(d) with the help of platelets and corpuscles
126. During oxygen transport the oxyhaemoglobin at the tissue level liberates oxygen to the cells
because in tissue
(a) O2
concentration is high and CO2
is low
(b) O2
concentration is low and CO2
is also low
(c) O2
tension is high and CO2
tension is low
(d) O2
tension is low and CO2
tension is high
127. The blood leaving the lungs has all its hemoglobin oxygenated and gives up oxygen to the tis-
sues because
(a) the tissue can absorb O2
from oxyhaemoglobin
(b) O2
concentration in tissues is lower and CO2
concentration is higher as compared to lungs
(c) O2
concentration in tissues is higher and CO2
concentration is lower as compared to lungs
(d) oxyhaemoglobin undergoes reduction
128. During one circuit of blood from lungs to the tissues and back through circulatory system, the
percentage of haemoglobin giving up its oxygen to tissues is
(a) 25% (b) 50% (c) 75% (d) 100%
Answer Keys -
1. (b) 2. (b) 3. (b) 4. (c) 5. (d) 6. (c) 7. (b) 8. (b) 9. (c) 10. (b)
11. (b) 12. (c) 13. (b) 14. (b) 15. (b) 16. (b) 17. (c) 18. (d) 19. (d) 20. (c)
21. (a) 22. (c) 23. (b) 24. (d) 25. (d) 26. (d) 27. (a) 28. (c) 29. (d) 30. (d)
31. (d) 32. (d) 33. (c) 34. (c) 35. (b) 36. (a) 37. (d) 38. (a) 39. (a) 40. (c)
41. (a) 42. (b) 43. (d) 44. (a) 45. (d) 46. (b) 47. (c) 48. (d) 49. (a) 50. (b)
51. (c) 52. (c) 53. (d) 54. (b) 55. (c) 56. (b) 57. (b) 58. (a) 59. (d) 60. (b)
61. (d) 62. (b) 63. (b) 64. (b) 65. (d) 66. (c) 67. (d) 68. (a) 69. (c) 70. (b)
71. (a) 72. (d) 73. (b) 74. (b) 75. (d) 76. (a) 77. (d) 78. (a) 79. (b) 80. (a)
81. (d) 82. (c) 83. (b) 84. (d) 85. (c) 86. (c) 87. (d) 88. (c) 89. (c) 90. (c)
91. (d) 92. (b) 93. (c) 94. (c) 95. (c) 96. (b) 97. (c) 98. (b) 99. (a) 100. (b)
101. (d) 102. (c) 103. (b) 104. (b) 105. (c) 106. (d) 107. (c) 108. (a) 109. (a) 110. (a)
111. (b) 112. (d) 113. (c) 114. (b) 115. (c) 116. (c) 117. (d) 118. (a) 119. (b) 120. (d)
121. (b) 122. (a) 123. (a) 124. (d) 125. (a) 126. (d) 127. (b) 128. (a)
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