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What is the approximate normal compositi...

What is the approximate normal composition of alveolar air ?

A

`14%` oxygen, `6%` carbon dioxide, `80%` nitrogen

B

`21%` oxygen, `2%` carbon dioxide, `77%` nitrogen

C

`16%` oxygen, `3%` carbon dioxide, `81%` nitrogen

D

`10%` oxygen, `8%` carbon dioxide, `82%` nitrogen

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The correct Answer is:
A
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NCERT FINGERTIPS-BREATHING AND EXCHANGE OF GASES-Breathing And Exchange Of Gases
  1. Consider the following statement each with two blanks. (i) Diaphragm...

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  2. Which of the following would have the same O(2) content?

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  3. What is the approximate normal composition of alveolar air ?

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  4. The CO(2) content by volume, in the atmospheric air is about

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

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

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

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

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  9. Which of the following statement is correct?

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

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

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

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

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

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  15. The oxygen dissociation curve is

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

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

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  18. When temperature decrease, oxy-Hb curve becomes

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

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

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