Respiratory System mcq 27.10.2020
1.
Vocal cords are situated at
a)
Pharynx b) Larynx c) Glottis d) bronchial tube
2.
Which is a common passage in swallowing food and breathing?
a)
Larynx b) Gullet c)
Glottis d) Pharynx
3.
The structure which prevents the entry of food into respiratory tract is
a)
Pharynx b) Larynx c) Glottis d) Epiglottis
4.
Skin is an accessory organ of respiration in
a)
human b) frog c) rabbit d) lizard
5.
Air is breathed through
a)Trachea
¾
lungs ¾ larynx¾pharynx
¾
alveoli
b)
Nose ¾
larynx ¾ pharynx ¾
bronchus ¾ alveoli ¾
bronchioles
c)
Nostrils ¾ pharynx ¾ larynx
¾
trachea ¾ bronchi ¾ bronchioles ¾
alveoli
d)
Nose ¾
mouth ¾ lungs
6.
Lungs have a large number of alveoli for
a)
having spongy texture and proper shape
b)
more surface area for diffusion of gases
c)
more space for increasing volume inspired air
d)
more nerves supply
7.
Oxygen dissociation curve of haemoglobin is
a)
sigoid b) hyperbolic c)
linear d) hypobolic
8.
Rate of respiration is directly affected by
a)
concentration of carbon dioxide
b)
oxygen in trachea
c)
concentration of oxygen
d)
diaphragm expansion
9.
One haemoglobin carry how many molecule of O2?
a)
4 b) 2 c) 6 d) 8
10.
One of the following is not respiratory pigment?
a)
Anthocyanin b) Haemoglobin
c)
Haemoerythrin d) Haemocfnin
11.
Lungs in addition to the respiratory function also help in
a)
excretion b) temperature regulation
c)
pH regulation d) maintaining balance of
body
12.
Cellular respiration depends upon the
a)
availability of carbohydrates in cells
b)
concentration of O2 in atmosphere
c)
presence of nitrogen with O2 in air
d)
transport of O2 to the cells
13.
Which have no specific organ for respiration but respire?
a)
Rabbit b) Cockroach c) Earthworm d) Frog
14.
Intercostal muscles occur in
a)
abdomen b) thigh c) ribs d) diaphragm
15.
Carbon dioxide is transported from tissues to respiratory surface by only
a)
plasma and erythrocytes b) plasma
c)
erythrocytes d) erythrocytes and leucocytes
16.
The exchange of gases in the alveoli of the lungs takes place by
a)
simple diffusion b) osmosis
c)
active transport d) passive
transport
17. Which one of
the following organs in the human body is most affected due to shortage of
oxygen?
a)
Intestine b) Skin c) Kidney d) Brain
18.
What is the vital capacity of our lungs?
a)
Inspiratory reserve volume plus tidal volume
b)
Total lung capacity minus expiratory reserve volume
c)
Inspiratory reserve volume plus expiratory reserve volume
d)
Total lung capacity minus residual volume
19. The function
of nasal cavity & nasopharynx is to
a)
warm the inspired air
b)
moisten the inspired air
c)
filter out the dust particles from the inspired air
d)
All of the above
20.
In expiration, diaphragm becomes
a)
flattened b) relaxed c) straightened d) arched
21.
Oxygenated blood from lungs is carried to the heart by
a)
pulmonary artery b) pulmonary vein
c)
coronary vein d) pre-cavals
22.
A person met with an accident and died instantly without any injury to heart,
brain, stomach and kidney.
One
of the following is a reason for his death
a)
Intestine got twisted
b)
RBC became coagulated
b)
Stomach stopped digestion
d)
Diaphragm got punctured
23.
Which energy is consumed in breathing?
a)
Mechanical b) Chemical
c)
Bioelectrical d) Physiccal
24.
The disease that occurs when the haemoglobin content of the blood goes down is
a)pleurisy
b)emphysema c) anaemia d) pneumonia
25.
Volume of air breathed in and out during normal breathing is called
a)
vital capacity b) I R V c) E R V d) tidal volume
26.
Although much CO2 is carried in blood, yet blood does not become
acidic, because
a)
it is absorbed by the leucocytes
b)
blood buffers play an important role in CO2 transport
c)
it combines with water to from H2CO3 which is neutralized
by NaCO3
d)
it is continuously diffused through tissues and is not allowed to accumulate
27.
The quantity 1500 ml in the respiratory volumes of a normal human adult refers
to
a)
maximum air that can be breathed in and breathed out
b)
residual volume
c)
expiratory reserve volume
d)
total lung capacity
28.
Trachea & bronchi possess
a)
incomplete cartilaginous rings
b)
complete cartilaginous rings
c)
thick muscular walls
d)
thick fibrous walls
29.
Oxygen carrying capacity of blood is
a)
20% b) 30% c) 40% d) 50%
30.
Carbonic anhydrase is mostly active in
a)
RBC b) WBC
c)
blood plasma d) blood platelets
31.
Vital capacity of lungs of an average human is
a)
3000-4500 ml b) 1500-1800 ml
c)
2000-2500 ml d) 500-1000 ml
32.
In the tissues, high concentrations of carbondioxide
a)
increases the affinity of haemoglobin to both oxygen and hydrogen
b)
increases the affinity of haemoglobin to oxygen but decreases its affinity to
hydrogen
c)
decreases the affinity of haemoglobin to oxygen but increases its affinity to
hydrogen
d)
decreases the affinity of haemoglobin to both oxygen and hydrogen
33.
The alveolar epithelium in the lungs is
a)
nonciliated columnar b) nonciliated
sequamous
c)
ciliated columnar b) ciliated squamous
34.
The carbon dioxide is transported via blood to lungs as
a)
dissolved in blood plasma
b)
in the form of carbonic acid only
c)
in combination with haemoglobin only
d)
carbaminohaemoglobin and as carbonic acid
35.
In alveoli of the lungs, the air at the site of gas exchange, is separate from
the blood by
a)
alveolar epithelium only
b)
alveolar epithelium and capillary endothelium
c)
alveolar epithelium, capillary endothelium and tunica adventitia
d)
alveolar epithelium, capillary endothelium, a thin layer of tunica media and
tunica adventitia
36.
When CO2 concentration in blood increases, breathing becomes
a)
shallower and slow
b)
there is no effect on breathing
c)
slow and deep
d)
faster and deeper
37. People
living at sea level have around 5 millions RBC per cubic millimeter of their
blood whereas those living at an altitude of 5400 metres have around 8
millions. This is because at high altitude
a)
atmospheric O2 level is less and hence more RBCs are needed to
absorb the required amount of O2 to survive
b)
there is more UV radiation which enhances RBC production
c)
people eat more nutritive food, therefore more RBCs are formed
d)
people get pollution – free air to breathe and more oxygen is available
38.
The breathing controlling centre of medulla oblongata is mainly under
a)
chemical control b) physical control
c)
neural control d) All of the
above
39. In which
form CO2 is carried in blood?
a) Sodium
bicarbonate b) Sodium carbonate
c) Potassium
carbonate d) Magnesium carbonate
40. The normal
rate of respiration in man per minute is about
a) 10 to 15
times b) 16 to 20 times
c) 19 to 21
times d) 23 to 25 times
41. The
transport of oxygen by the blood takes place by
a)leucocytes b)thrombocytes
c)pasma d)erythrocytes
42. O2
is transported in vertebrates as
a) dissolved in
plasma
b) complexed
with haemoglobin
c) dissolved in
cytoplasm of erythrocytes
d) absorbed over
the RBC
43. The covering
of the lung is called
a) pericardium b) perichondrium
c) pleural
membrane d) peritoneum
44. Diaphragm
present in mammals is
a) membrane
between external & middle ear
b) membrane
around the brain
c) partition
between the thoracic & abdominal cavities
d) membrane
around lungs
45. Percentage
of oxygen supplied by haemoglobin is
a) 97% b) 100% c) 49% d) 3%
46. On
high mountain difficulty in breathing is due to
a) decreases in
pressure of O2
b) decreases in
amount of O2
c) increase in
CO2 concentration
d) all of the
above
47. During
inspiration, the diaphragm
a) expands
b) shows no
change
c) contracts and
flattens
d) relaxes to
become dome-shaped
48. 500 ml
respiratory volume in a normal adult human is related
a) residual
volume b) total lung capacity
c) respiratory
reserve volume d) tidal volume
49. Body tissues
obtain oxygen from haemoglobin because of its dissociation in tissues caused by
a) low oxygen
concentration and high carbon dioxide concentration
b) low oxygen
concentration
c) low carbon
dioxide concentration
d) high carbon
dioxide concentration
50. Which is
false?
a) Blood from
Right side of heart is carried to lungs by pulmonary artery
b) Pleura is
double covering of kidney
c) Pancreas is
both exocrine and endocrine gland
d) Scurvy is due
to vitamin C deficiency
51. If the
thoracic wall but not lunges is punctured
a) the lungs get
inflated
b) the man dies
as the lungs get collapsed
c) the breathing
rate decreases
d) the breathing
rate increases
52. What is the
cause for the movement of oxygen through the alveolar blood capillaries of
lungs?
a) Difference in
the O2 tension and partial pressure of these chambers b) Partial pressure of CO2
c) Union of O2
with haemoglobin d) All
53. One of the
following is a difference between pulmonary respiration of frog and human
a) diaphragm and
ribs play role in respiration in frog
b) lungs are
respiratory organs
c) respiration
occurs due to pressure gradient in human
d) None of above
54. How the
transport of O2 and CO2 by blood happens?
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
55. The
breathing rate gets increased by the increase in the content of
a) nitrogen b) oxygen
c) carbon dioxide d) carbon monoxide
56. Blood
analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin
content. Which of the following conclusions is most likely to be correct? The
patient has been inhaling polluted air containing unusually high content of
a) carbon
disulphide b) chloroform
c) carbon
dioxide d) carbon monoxide
57. Which two of
the following changes (a-d) usually tend to occur in the plain dwellers when
they move to high altitudes (3,500 m or more)?
a) Increase in
red blood cell size
b) Increase in
red blood cell production
c) Increased
breathing rate
d) Increase in
thrombocyte count
Change occurring
are:
a) (B) and (C) b) (C) and (D)
c) (A) and (D) d) (A) and (B)
58.
Which one of the following is a possibility for most of us in regard to
breathing, by making a conscious effort?
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 breathing in and 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
59.
Which one of the following mammalian cells is not capable of metabolising
glucose to carbondioxide aerobically?
a)
Unstraited muscle cells b) Liver
cells
c)
Red blood cells d) White
blood cells
60.
For proper transport of O2 & CO2 blood should be
a)
slightly acidic b) strongly
acidic
c)
strongly alkaline d) slightly
alkaline
61.
At higher CO2 concentration, oxygen dissociation curve of
haemoglobin will
a)
move to left b) move to right
c)
become irregular d) move upwardly
62.
Which is the part of pulmonary of lung division where gaseous exchange takes
place?
a)
bronchiole b) alveolus
c)
air chamber d) trachea
63.
Total oxygen that can be carried by blood is
a)1000-1200 ml
b)2000-3000 ml c)200 ml d)100 ml
64.
What is percentage of haemoglobin in RBCs?
a)
3% b) 10% c) 28% d) 35%
65.
Respiratory pigment or oxygen carrier in frog’s blood is
a)
haemocyanin b) haemoglobin
c)
haemazoin d) lymphocytes
66.
Blood haemoglobin has high affinity for
a)
CO2 b) CO c) O2 d) H
67.
The toxic effect of CO is due to its greater affinity for haemoglobin as
compared to O2 approximately by
a)
2 times b) 20 times c) 200 times d) 1000 times
68.
Common feature of human and insect trachea is
a)
non-collapsible wall b) supporting
rings
c)
ectodermal origin d) endodermal origin
69.
Which is correct?
a)
Respiratory centres are not affected by CO2
b)
In human vital capacity is just double the expiratory volume
c)
A human lung has 103 alveoli
d) During
inspiration the lungs create suction pump
70.
During transportation of CO2 when bicarbonate ions diffuses from RBC
into plasma, the increased hydrogen ion concentration RBC is balanced by the
entry of which substance from plasma into
a)water
b)oxygen c)hydroxyl ions d) chloride ions
71.
Mark the correct statement.
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 of these
72.
Which of the following statement correctly defines Bohr effect?
a)
Rise in p50 with a decrease in CO2 conc.
b)
Rise in p50 with decrease in pH
c)
Rise in p50 with increase in O2
d)
Fall in p50 with decrease in pH
73.
Mark the correct statement
a)
Volume of residual air is higher than tidal volume
b)
Volume of complementary air is higher than tidal volume
c)
Volume of supplementary air is lower than residual capacity
d)
All of these
74.
Which of the following statements are correct
i)
The blood transports CO2 comparatively easily because of its higher
solubility
ii)
Approximately 8-9% of CO2 is transported being dissolved in the
plasma of blood.
iii)
The carbon dioxide produced by the tissuses, diffuses passively into the blood
stream and passes into red blood corpuscles and react with water to form H2CO3
iv)
The oxyhaemoglobin (HbO2) of the erythrocytes is basic.
v)
The chloride ions diffuse from plasma into the erythrocytes to maintain ionic
balance.
a)
(i), (ii) and (iv) are true, (ii) and (iv) are false.
b)
(i), (iii) and (v) are false, (ii) and (iv) are true
c)
(i), (ii) and (iv) are true, (iii) and (v) are true
d)
(i), (ii) and (iv) are false, (iii) and (v) are true
75.
In the following statements:
(i)Carbonic
anhydrase is present in the erythrocytes
(ii)
In erythrocytes the carbon dioxide combine with water and is transported
a)
Statement (i) is correct and is responsible for ststement (ii)
b)
Statement (i) is correct and is responsible statement(ii)
c)
Both statement (i) and (ii) are wrong
d)
Statement (i) is correct but not involved in statement (ii).
76.
Which one of the following four organs is correctly matched with its
characteristics?
|
Column I Organs |
Column II Characteristics |
|
A. Bronchi |
Two branches of the trachea that brings sir into
the lungs |
|
B. Trachea |
Small flap that prevents food from entering |
|
C. Diaphragm |
Dome shaped muscle that pushes on the lungs during
exhalation |
|
D. Alveoli |
Pair of organs that inflateas you inhale deflate
as you exhale |
a)
A and B only b) C and D only
c)
A and C only d) B and D only
77.
Choose the combinationof labeling from the given optins
a) I-Nose,
II-Bronchus, III-Larynx, IV-Diaphragm, V-Trachea, VI-Lung
b) I-Nose,
II-Larynx, III-Bronchus, IV-Lung, V-Diaphragm, VI-Trachea
c) I-mouth,
II-Trachea, III-Larynx, IV-Lung, V-diaphragm, VI-Bronchus
d) I-mouth,
II-diaphragm, III-Trachea, IV-Bronchi, V-Larynx, VI-Lung
78. In man and
mammals , air passes from outside into the lungs through
a) Nasal cavity ® pharynx ® larynx ® trachea ® bronchioles ® bronchi ® alveoli
b) Nasal cavity ® pharynx ® larynx ® trachea ® bronchi ® bronchioles ® alveoli
c) Nasal cavity ® larynx ® pharynx ® trachea ® bronchi ® alveoli
d) Nasal cavity ® larynx ® pharynx ® trachea ® bronchioles ® alveoli
79.
External gills, tracheae, and lungs all share which of the following sets of
characteristics?
a)
Part of gas-exchange system, exchange both CO2 and O2;
increase surface area for diffusion.
b)
Used by water breathers; based on countercurrent exchange; use negative
pressure breathing.
c)
Exchange only O2; are associated with a circulatory system; found in
vertebrates.
d)
Found in insects; employ positive-pressure pumping based on crosscurrent flow.
ANSWER KEY
1.B 2.D 3.D 4.B 5.C 6.B 7.A 8.A 9.A 10.A 11.C 12.D 13.C 14.C
15.A 16.A 17.D 18.D 19.D 20.D 21.B 22.D 23.B 24.C 25.D 26.B 27.B 28.A
29.A 30.A 31.A 32.C 33.B 34.D 35.B 36.D 37.A 38.A 39.A 40.A 41.D 42.B
43.C 44.C 45.A 46.A 47.C 48.D 49.D 50.B 51.B 52.A 53.C 54.A 55.C 56.D
57.A 58.B 59.C 60.D 61.B 62.B 63.A 64.C 65.B 66.B 67.C 68.A 69.D 70.D
71.A 72.B 73.D 74.A 75.A 76.C 77.A 78.B 79.A
Wow superb MCQ sir, thank you very much sir
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