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Most of the carbon dioxide produced by tissues is carried back to the lungs as
  • a)
    bicarbonate ions
  • b)
    reduced haemoglobin
  • c)
    carbaminohaemoglobin
  • d)
    a gas dissolved in plasma
Correct answer is option 'A'. Can you explain this answer?
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Most of the carbon dioxide produced by tissues is carried back to the ...
Most of the carbon dioxide produced by tissues is carried back to the lungs as .these are three ways carbon dioxide is carried in the blood stream from the peripheral tissues back to the lungs 1) as a dissolved gas 2) as bicarbonate 3) bound to hemoglobin ( and other proteins) as a carbaminohemoglobin
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Most of the carbon dioxide produced by tissues is carried back to the ...

There are three ways carbon dioxide is carried in the bloodstream from the peripheral tissues back to the lungs: (1) as a dissolved gas, (2) as bicarbonate, and (3) bound to hemoglobin (and other proteins) as carbaminohemoglobin. As carbon dioxide diffuses from peripheral tissues into the bloodstream, approximately 10% of it remains dissolved in the plasma, or the extracellular fluid matrix of the blood, to a partial pressure of about 45 mmHg.
[2]
 The majority of the carbon dioxide that diffuses through the capillaries and, ultimately, into the red blood cells combines with water in a chemical reaction catalyzed by the enzyme carbonic anhydrase to form carbonic acid. Carbonic acid almost immediately dissociates into a proton and a bicarbonate anion (HCO3-).  Thus, bicarbonate is the principal means by which carbon dioxide is transported throughout the bloodstream according to the equation CO2 + H2O --> H2CO3 --> H+ + HCO3-.

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Most of the carbon dioxide produced by tissues is carried back to the lungs asa)bicarbonate ionsb)reduced haemoglobinc)carbaminohaemoglobind)a gas dissolved in plasmaCorrect answer is option 'A'. Can you explain this answer?
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