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 Why mature R.B.Cs of human beings respire anaerobically ?


Mature R.B.Cs. lack mitochondria and that is why they respire anaerobically.
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What percent of CO2 is tranported through plasma and in which state ?

About 7% of CO2 is carried in the dissolved state through plasma 

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 What is the function of respiratory rhythm centre?

The respiratory rhythm centre maintains and moderates the respiratory rhtym according to suit the demands of the body tissue. 
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What is the significance of lining of mucus on inner side of trachea ?

The mucus lining on the inner side of the trachea traps the dust particles and bacteria that enter the respiratory system along with inhaled air.
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 What is chloride shift or Hamburger’s phenomenon ? What is its significance in respiration ?

It is the phenomenon of passing CI' into RBC and in return passing out of HCO3' into plasma from RBC. Its significance is to maintain ionic equilibrium. 
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