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In lungs, the air is separated from the ...

In lungs, the air is separated from the venous blood through

A

transitional epithelium + tunica externa of blood vessel

B

squamous epithelium + endothelium of blood vessel

C

squamous epithelium + tunica media of blood vessel

D

none of these

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Verified by Experts

The correct Answer is:
B
The wall of the alveoli is very thin and has a rich network of blood capillaries. The alveolur capillary membrane consists mainly of squamous epithelium, epithelial basement membrane and capillary endothelium.
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NCERT FINGERTIPS-BREATHING AND EXCHANGE OF GASES-Breathing And Exchange Of Gases
  1. The CO(2) content by volume, in the atmospheric air is about

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  2. Among the following the partial pressure of oxygen is maximum in

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  3. In lungs, the air is separated from the venous blood through

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  4. The factor which does not affect the rate of alveolar diffusion is

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  5. Besides RBC, blood plasma also carries O(2) in solution. The percentag...

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  6. Which of the following statement is correct?

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  7. Which of the following statement is true about RBCs in humans?

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  8. The carbon dioxide is transported via blood to lungs mostly

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  9. Blood carries the CO(2) in three forms. The correct percentages of CO(...

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  10. Bluk of oxygen diffuses from the plasma into the red blood corpuscles ...

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  11. One haemoglobin carries how many molecules of O(2) ?

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  12. The oxygen dissociation curve is

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  13. Which of the following is incorrect about the given graph ?

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  14. The given graph shows an oxygen dissociation curve for haemoglobin. ...

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  15. When temperature decrease, oxy-Hb curve becomes

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  16. Which of the following factors is not favourable for the formation of ...

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  17. Consider for following four statements and select the correct option s...

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  18. After taking a long deep breath we do not respire for some seconds due...

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  19. A large proportion of oxygen remain unused in the human blood even aft...

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  20. In the tissues, high concentrations of carbon dioxide

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