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  • Carbon dioxide that enters the RBCs forms a reversible compound with amino group <img alt="\left (NH_{2} \right )" src="https://learn.careers360.com/latex-image/?%5Cleft%20%28NH_%7B2%7D%2

Carbon dioxide that enters the RBCs forms a reversible compound with amino group \left (NH_{2} \right ) of globin part of hemoglobin. This compound is called

 

Option: 1

Carbaminohemoglobin

 


Option: 2

Oxyhaemoglobin

 


Option: 3

Carboxyhemoglobin

 


Option: 4

Carbaminohemoglobin

 


Answers (1)

best_answer

 

 

Transport of Carbon Dioxide -

Nearly 20-25 percent of CO2 is transported by RBCs:

  • The carbon dioxide that enters the RBCs forms a reversible compound with an amino group (NH2) of the globin part of haemoglobin.
  • The compound so formed is called carbaminohemoglobin. 

70 percent of it is carried as bicarbonate:

  • In the RBCs, a zinc enzyme carbonic anhydrase speeds up the formation of carbonic acid.
  • Carbonic acid is a weak acid and quickly dissociates into hydrogen and bicarbonate ions.
  • The hydrogen ions are buffered by the haemoglobin to form the haemoglobinic acid.
  • As bicarbonate ions accumulate in the RBCs, some of them diffuse out into the plasma to prevent the formation of CO2 in the RBCs. 
  • In order to maintain the ionic balance of blood plasma, the chloride ions diffuse into the RBCs.
  • This phenomenon is called the chloride shift or Hamburger Phenomenon
  • The bicarbonate ions in the plasma combine with sodium ions to form sodium bicarbonate. These form an important buffering system.

 

Carbon dioxide that enters the RBCs forms a reversible compound with amino group \left (NH_{2} \right ) of globin part of hemoglobin. The compound so formed in called carbaminohemoglobin.

Posted by

Rakesh

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