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The given figure shows a diagrammatic representation of the exchange of gases at the alveolus and the body tissues with blood and the transport of oxygen and carbon dioxide. Identify the blood vessels A to D.
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Important Questions on Breathing and Exchange of Gases

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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 40
Consider the following statements each with two blanks.
(i) Diaphragm contracts to help in ___(1)____ while the contraction of abdominal muscles helps in ___(2)____.
(ii) Vital capacity of trained athletes is ___(3)____ than that of non-athletes while the vital capacity of non-smokers is ___(4)____ than that of smokers.
(iii) Alveolar PO2 is ___(5)____ than the venous PO2 while arterial PO2  is ___(6)____ than the alveolar PO2 .
Which of the following options gives the correct fill ups for the respective blanks numbered from (1) to (6) in the
above statements?
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 41
Which of the following would have the same O2 content?
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 42
What is the approximate normal composition of alveolar air?
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 43
The CO2 content by volume, in the atmospheric air is about
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 44
Among the following the partial pressure of oxygen is maximum in:
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 45
In lungs, the air is separated from the venous blood through:
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 46
The factor which does not affect the rate of alveolar diffusion is
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 17 - Breathing and Exchange of Gases>MCQS CORNER>Q 47
Besides RBC, blood plasma also carries O2 in solution. The percentage is