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Byju's Answer

Standard XII

Biology

Exchange of Gases

Choose the ri...

Question

Choose the right sequential phenomena among the following during the delivery of $O_{2}$ from blood 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 in the presence of carbonic anhydrase enzyme.
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 in the presence of carbonic anhydrase enzyme.
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 $H b O_{2}$ 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 C P, Q, S
A. P, Q, T
Reason: In tissues, the concentration of co2 is more than that o2. The co2 moves into the blood and reaches hemoglobin in RBCs. In RBCs, an enzyme is called carbonic anhydrase. The presence of these ions make o2 to leave the hemoglobin and so oxyhemoglobin complex is broken.

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Similar questions

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}

Q. Assertion :

C O_{2}

is carried in the plasma mainly as

H C O_{3}^{-}

ions. Reason: Zinc-containing enzyme carbonic anhydrase of RBCs catalyses the formation of

H C O_{3}

ions that enter plasma.

5% of $C O_{2}$ is dissolved in ___(i)____. Another form in which $C O_{2}$ is transported is when it combines with hemoglobin and this form is called ___(ii)____hemoglobin. $C O_{2}$ entering the erythrocytes reacts with water to form carbonic acid in the presence of ____(iii)_____. Carbonic acid is an intermediate step; it dissociates to form a hydrogen ion $(H^{+})$ from the carbonic acid, leaving___(iv)____ dissolved in the blood.

Q. Which of the following statements are true/false?
(1) The blood transports

C O_{2}

comparatively easily because of its higher solubility.
(2) Approximately 8.9 % of

C O_{2}

is transported being dissolved in the plasma of blood.
(3) The carbon dioxide produced by the tissues,diffuses passively into the blood stream and passes into red blood corpuscles and react with water to form

H_{2} C O_{3}

.
(4) The oxyhaemoglobin(

H b O_{2}

) of the erythrocytes is basic.
(5) The chloride ions diffuse from plasma into the erythrocytes to maintain ionic balance.

Q. In a solution of

N a H C O_{3}

, in amphiprotic anion can undergo ionization to form

H^{+}

ion and hydrolysis to form

O H^{-}

ion.

H C O_{3}^{-} + H_{2} O i o n i z a t i o n ⇋ C O_{3}^{2 -} + H_{3} O^{+}

H C O_{3}^{-} + H_{2} O h y d r o l y s i s ⇋ H_{2} C O_{3}^{-} + O H^{-}

to calculate pH, suitable approximation is :

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