SATHEE: Breathing and Exchange of Gases Question 34

Breathing and Exchange of Gases Question 34

34. Carbon dioxide is transported from tissues to respiratory surface by only

(a) plasma and erythrocytes

(b) plasma

(d) erythrocytes and leucocytes

Show Answer

Answer : a

Hints & Solution

(a) $C O_{2}$ from the respiratory tissues to the lungs is transported by the blood in 3 ways:
(i) In dissolved state or as a physical solution: Very small amount physically dissolved in plasma ( 7% i.e. $≅ 0.3 m l$ of $C O_{2}$ by each $100 m l$ of blood)
(ii) Bicarbonate ions: $≅$ 70% (i.e. $≅ 2.5 m l$ per $100 m l$ of blood) $C O_{2}$ diffuses in plasma & then into RBCs where it (in the presence of carbonic anhydrase) combines with $H_{2} O$ to form carbonic acid which is almost spontaneously dissociated into hydrogen ion & bicarbonate ions.
(iii) Carbaminohaemoglobin: $≅$ 23% (i.e. $≅$ $1 m l$ of $C O_{2}$ per $100 m l$ of blood) combines with haemoglobin forming an unstable compound.

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Breathing and Exchange of Gases Question 34

34. Carbon dioxide is transported from tissues to respiratory surface by only

Answer : a

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