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Biology

Respiration involving following steps -
A. Diffusion of gases O subscript 2 end subscript and C O subscript 2 end subscript across alveolar membrane
B. Transport of gases by blood
C. Utilization of O subscript 2 end subscript by cell for catabolic reactions and resultant release of C O subscript 2 end subscript
D. Pulmonary ventilation by which atmospheric air is drawn in and C O subscript 2 end subscript rich alveolar air is released out
E. Diffusion of O subscript 2 end subscript and CO? between blood and tissues.
The correct sequence of steps is -

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  1. A—> B —> C —> D —> E    
  2. E —> D —> C —> B —> A    
  3. C —> B —> E —> A —> D    
  4. C —> E —> B —> A -> D    

    Answer:The correct answer is: C —> E —> B —> A -> D

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