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  • External respiration refers to   Option: 1 diffusion of <img alt="O_{2}" src="https://learn.careers

External respiration refers to 

 

Option: 1

diffusion of O_{2} and CO_{2} between blood and tissues

 


Option: 2

transport of gases by the blood.

 


Option: 3

diffusion of gases (O_{2} and CO_{2}) across the alveolar membrane

 


Option: 4

the utilisation of O_{2} by the cells for catabolic reactions

 


Answers (1)

best_answer

 

 

Overview of the Process of Respiration -

Respiration involves the following steps:

  • Breathing or pulmonary ventilation by which atmospheric air is drawn in and CO2  rich alveolar air is released out. It is also called gaseous exchange by lungs.
  • Diffusion of gases (O2 and CO2) across the alveolar membrane. This is called external respiration.
  • Transport of gases by the blood.
  • Diffusion of O2 and CO2 between blood and tissues. This is called internal respiration.
  • The utilisation of O2 by the cells for catabolic reactions and resultant release of CO2. this is called cellular respiration.

Hence the correct option is diffusion of gases (O2 and CO2) across the alveolar membrane

 

 

 

 

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vinayak

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