41.
Oxygen carring by blood is liberated in A
Arteris
B
Capillaries of body
C
Capillaries of lungs
D
Heart
Answer :
Capillaries of body
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42.
Although much $$C{O_2}$$ 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 $$C{O_2}$$ transport
C
it combines with water to form $${H_2}C{O_3}$$ which is neutralized by $$NaC{O_3}$$
D
it is continuously diffused through tissues and is not allowed to accumulate
Answer :
blood buffers play an important role in $$C{O_2}$$ transport
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43.
In man, the structure with a function similar to spiracles of cockroach are A
Lungs
B
Alveoli
C
Bronchioles
D
Nostrils
Answer :
Nostrils
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44.
Skin is an accessory organ of respiration in A
humans
B
frog
C
rabbit
D
lizard
Answer :
frog
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45.
The long trachea of rabbit contains A
Buccal
B
Thyroid
C
Complete tracheal
D
Right atrium and right ventricle
Answer :
Right atrium and right ventricle
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46.
Which is correct A
Respiratory centres are not affected by CO2
B
In humans vital capacity is just double the expiratory volume
C
A human lung has 103 alveoli
D
Not definite
Answer :
Not definite
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47.
Select the correct events that occur during inspiration. A
(iii) and (iv)
B
(i), (ii) and (iv)
C
Only (iv)
D
(i) and (ii)
Answer :
(i) and (ii)
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48.
Respiratory centre in brain occurs in A
Medulla oblongata
B
Cerebellm
C
Hypothalamus
D
Pericardium
Answer :
Medulla oblongata
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49.
Most of the carbon - di - oxide is carried in the blood as A
Bicarbonates
B
Carbon monoxide
C
Carbonic acid
D
Carbonates
Answer :
Bicarbonates
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50.
Respiratory centre of brain is stimulated by A
Carbon dioxide content in venous blood
B
Carbon dioxide content in arterial blood
C
Oxygen content in venous blood
D
Oxygen content in arterial blood
Answer :
Carbon dioxide content in arterial blood
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