Which of the following carries carbon dioxide during exhalation?
I. Plasma
II. Erythrocytes
III. Haemoglobin molecules

I only

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II only

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III only

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I and II

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I, II and III

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Solution

The correct option is E I, II and III
Carbon dioxide (CO $_{2}$ ) is carried in human body in 3 different ways:- (i) CO $_{2}$ is highly soluble in the blood. So it remains dissolved in the plasma. (ii) CO $_{2}$ remains attached to the haemoglobin and forms a reversible compound called carbamino-haemoglobin. (iii) CO $_{2}$ enters into erythrocytes, gets converted into carbonic acid by carbonic anhydrase and finally into bicarbonate ions.
Hence the correct option is D.

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Similar questions

Choose the correct answer from the options below:

(a) (i) and (iv)
(b) (ii) only
(c) (ii) and (iii)
(d)(i) and (ii)

O_{2}^{+}

N O

N_{2}^{+}

(i) In plants, respiration happens during the night time only, while photosynthesis happens during the day.

(ii) In humans, the exchange of gases takes place in the alveoli.

(iii) Haemoglobin has a greater affinity for oxygen than carbon dioxide.

(iv) Aquatic organisms use the oxygen in the surrounding atmosphere for respiration.

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