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CBSE Class 11-science Answered

A: exchange of O2 and CO2 occurs by active transport R: rate of diffusion does not depend on the partial pressure of O2 and CO2
Asked by arushidabhade | 05 Aug, 2019, 07:46: PM
Expert Answer
  • Both assertion and reason are false.
  • Gases are exchanged between the alveolar air and the blood by diffusion.
  • The rate of diffusion is determined by partial pressure gradients across the respiratory membrane in our lungs. Partial pressure is a function of both concentration and atmospheric pressure.
  • The partial pressure for oxygen is much greater than that of carbon dioxide. 
 
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