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Byju's Answer

Standard VII

Biology

Blood Vessels

Read the foll...

Question

Read the following sentences carefully and select the incorrect option :

C O_{2}

combines with hamaeglobin, at tissue level to form carbaminohemoglobin

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C O_{2}

is removed from blood, at the alveolar level where

p O_{2}

is low and

p C O_{2}

is high in lungs.

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C O_{2}

reacts with

H_{2} O

to form carbonic acid in presence of enzyme carbonic anhydrase and

Z n^{+ 2}

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Every

100 m l

of oxygenated blood delivers about

5 m l

O_{2}

to tissues at rest.

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Solution

The correct option is B $C O_{2}$ is removed from blood, at the alveolar level where $p O_{2}$ is low and $p C O_{2}$ is high in lungs.
In the tissues where pCO2 is high, it inspires bound to blood while in the alveoli where pCO2 is low and pO2 is high, it gets expelled from the blood.
So, the correct option is 'CO2 is removed from the blood, at the alveolar level where pO2 is low and pCO2 is high in lungs'.

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Similar questions

Q. Assertion :At the tissue level, 70 the of

C O_{2}

formed from catabolism is trapped as bicarbonate in the RBCs. Reason: At the tissue level, carbonic anhydrase in RBCs facilitates the formation of

C O_{2}

and

H_{2} O

from bicarbonate.

Q. 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}

Bulk of carbon dioxide $(C O_{2})$ released from body tissues into the blood is present as

Q. The enzyme carbonic anhydrase catalyzes the hydration of

C O_{2}

. This reaction:

C O_{2} + H_{2} O \to H_{2} C O_{3}

, is involved in the transfer of

C O_{2}

from tissues to the lungs via the bloodstream.

One enzyme molecule hydrates

10^{6}

molecules of

C O_{2}

per second. How many kgs of

C O_{2}

are hydrated in one hour in one liter by

1 \times 1^{- 6} M

enzyme?

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.

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