What will be the pO2 and pCO2 in the atm | Class 11 Biology Chapter Breathing and Exchange of Gasses, Breathing and Exchange of Gasses NCERT Solutions

Question: What will be the pO2 and pCO2 in the atmospheric air compared to those in the alveolar air?
(i) pO2 lesser, pCO2 higher
(ii) pO2 higher, pCO2 lesser
(iii) pO2 higher, pCO2 higher
(iv) pO2 lesser, pCO2 lesser
Answer:

(ii) pO2 higher, pCO2 lesser

The partial pressure of oxygen in atmospheric air is higher than that of oxygen in alveolar air. In atmospheric air, pO2 is about 159 mm Hg. In alveolar air, it is about 104 mm Hg.

The partial pressure of carbon dioxide in atmospheric air is lesser than that of carbon dioxide in alveolar air. In atmospheric air, pCO2 is about 0.3 mmHg. In alveolar air, it is about 40 mm Hg.


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Comments

  • Achu
  • 2020-08-26 21:40:07

Very much useful for me


  • deva
  • 2020-04-04 18:00:09

we breath air from atmosphere so isnt it supposed to be same?


  • debajitdas
  • 2019-12-09 08:42:17

Nice


  • Afifa Bano
  • 2019-12-02 06:34:22

Thanks


  • Arjun goud
  • 2019-04-19 00:49:03

Good


  • Arjun goud
  • 2019-04-19 00:48:44

Thanks


  • Hitesh gowda
  • 2018-09-25 06:20:43

Very helpful


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 5: What will be the pO2 and pCO2 in the atmospheric air compared to those in the alveolar air? (i) pO2 ....