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Body Fluids

Which stateme...

Question

Which statements are true/false
(a) Blood transports $C O_{2}$ comparatively easily because of its high solubility.
(b) Approximately $8.9 %$ of $C O_{2}$ is transported dissolved in plasma.
(c) $C O_{2}$ diffuses into blood, passes into RBCs and reacts with water to form $H_{2} C O_{3}$ .
(d) Oxyhaemoglobin of erythrocytes is basic.
(e) Chloride ions diffuse into erythrocytes to maintain ionic balance.

A

a, b and d are true, c and e are false

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B

a, c and e are true, b and d are false

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C

a, c and e are false, b and d are true

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D

a, b and d are false, c and e are true

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Solution

The correct option is B
a, c and e are true, b and d are false

Correct statements
(a)Blood transports $C O_{2}$ comparatively easily because of its high solubility.
The solubility of $C O_{2}$ is $20 - 25$ times higher than that of $O_{2}$ . Hence, about $7 %$ of $C O_{2}$ is transported in the dissolved form in plasma to the lungs.

(c) $C O_{2}$ diffuses into blood, passes into RBCs and reacts with water to form $H_{2} C O_{3}$ .

Carbonic anhydrase enzyme is present in significant amounts in RBCs and in minor quantities in plasma too. This reversibly catalyses the conversion of $C O_{2}$ and $H_{2} O$ into $H_{2} C O_{3}$ . $H_{2} C O_{3}$ dissociates into $H^{+}$ and $H C O_{3}$ -. Around $70 %$ $C O_{2}$ is transported this way.

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Similar questions

Q. Which of the following statements are true/ false?

A. The blood transports

C O_{2}

comparatively easily because of its higher solubility.

B. Approximately 10% of

C O_{2}

is transported being dissolved in the plasma of blood.

C. The carbon dioxide produced by the tissues diffuses passively into the bloodstream and passes into red blood corpuscles and reacts with water to form

H_{2} C O_{3}

.

D. The sodium ions diffuse from plasma into the erythrocytes to maintain ionic balance.

E. The chloride ions diffuse from plasma into the erythrocytes to maintain ionic balance.

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.

C O_{2}

passes into blood and transported to alveolar site in the form of.

Q. Go through the following statements

(i) The oxygen-haemoglobin dissociation curve is a sigmoid curve.
(ii) About

4.5

C O_{2}

can combine with Hb in

100

ml of blood in the form of carbamino- haemoglobin.
(iii) High

p O_{2}

tends to displace

C O_{2}

from haemoglobin and this is called the Haldane effect.
(iv) The movement of chloride ions from plasma into RBCs at the time of

C O_{2}

transport is called Hamburger’s phenomenon.

Which of these are correct?

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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