51.
Narrowest and most abundant tubes of lungs are
A
Bronchioles
B
Bronchus
C
Alveoli
D
Trachea
Answer :
Bronchioles
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52.
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
Answer :
carbaminohaemoglobin and as carbonic acid
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53.
What percentage of CO2 flows in blood in form of bicarbonates
A
7%
B
23%
C
50%
D
70%
Answer :
70%
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54.
In alveolar air, the partial pressure of CO2 is
A
40 mm of Hg
B
42 mm of Hg
C
44 mm of Hg
D
46 mm of Hg
Answer :
40 mm of Hg
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55.
Larynx is a modified portion of
A
Pharynx
B
Trachea
C
Bronchus
D
Lungs
Answer :
Trachea
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56.
The function of tracheal cilia is to
A
Pass mucus out
B
Pass mucus in
C
Pass air out
D
Pass air in
Answer :
Pass mucus out
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57.
The two nasal chambers are separated by which bone (in human
A
Mesethmoid
B
Ethmoid
C
Maxilla
D
Palatine
Answer :
Ethmoid
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58.
Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
A
Inspiratory Reserve Volume
B
Tidal Volume
C
Expiratory Reserve Volume
D
Residual Volume
Answer :
Residual Volume
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59.
Azygous lobe is part of
A
Lung
B
Kidney
C
Larynx
D
Palate
Answer :
Lung
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60.
In alveoli of the lungs, the air at the site of gas exchange, is separated 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
Answer :
alveolar epithelium and capillary endothelium
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