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Blood Vessels

Choose the ri...

Question

Choose the right sequential phenomena among the following during the delivery of $O_{2}$ from blood to tissue.
P: Absorption of $C O_{2}$ by the blood.
Q: Reaction of absorbed $C O_{2}$ with $H_{2} O$ to form $H_{2} C O_{3}$ within RBC and its conversion into $H^{+}$ and $H C O_{3}^{-}$ ions.
R: Reaction of absorbed $C O_{2}$ with $H_{2} O$ in plasma to form $H_{2} C O_{3}$ and its conversion into $H^{+}$ and $H C O_{3}^{-}$ ions.
S: Combination of $H^{+}$ with heme portion of $H b O_{2}$ to release $O_{2}$ .
T: Combination of $H C O_{3}^{-}$ with heme portion of $H b O_{2}$ to form reduced hemoglobin and release of $O_{2}$ .

P, Q, T

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P, R, S

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P, Q, S

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P, R, T

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Solution

The correct option is A P, Q, T
In tissues, the concentration of CO $_{2}$ is more than that of O $_{2}$ . So, the CO $_{2}$ moves into the blood and reaches hemoglobin in RBCs. In RBCs, an enzyme called carbonic anhydrase forms carbonic acid from CO $_{2}$ and H $_{2}$ O that soon dissociates into bicarbonate and hydrogen ions. The presence of these ions make O $_{2}$ to leave the hemoglobin and so oxyhemoglobin (HbO $_{2}$ ) complex is broken. CO $_{2}$ thus becomes a part of hemoglobin and is transported to the lungs.
Hence, the correct answer is 'P,Q,T'

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Similar questions

O_{2}

C O_{2}

C O_{2}

H_{2} O

H_{2} C O_{3}

H^{+}

H C O_{3}^{-}

C O_{2}

H_{2} O

H_{2} C O_{3}

H^{+}

H C O_{3}^{-}

H^{+}

H b O_{2}

O_{2}

H C O_{3}^{-}

H b O_{2}

O_{2}

In the transport of CO2 from the tissues to the lungs which of the following occurs in the venous blood?

A) conversion of CO2 and H2O to H+ and HCO3-- in the RBC'S

B) Buffering of H+ by oxy haemoglobin

C) Shifting of HCO3-- into the RBC'S from plasma in exchange for Cl-

D)Alkalinization of RBC's

C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}

C O_{2}

C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}

C O_{2}

C O_{2}

C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{- 1}

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