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 | 5th 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. 

Answered by Sheetal Kolte | 6th Aug, 2019, 10:51: AM