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Human Respiratory System

In mammals, c...

Question

In mammals, carbon dioxide is transported from tissues to respiratory surface by

A

Plasma only

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B

RBC

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C

WBC

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D

Both A and B

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Solution

The correct option is D Both A and B
Blood is the medium of transport for oxygen and carbon dioxide. Nearly 20-25% of carbon dioxide is transported by RBCs, whereas 70% of it is carried as bicarbonate. About 7% of carbon dioxide is carried in a dissolved state through plasma.

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Q. Carbon dioxide is transported from tissue to respiratory surface by only

Q. Which of the following statements are correct/incorrect?
I. The blood transports carbon dioxide comparatively easily because of its highest solubility.
II. Approximately 89% of carbon dioxide is transported being dissolved in the plasma of blood.
III. 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}

.
IV. The oxyhaemoglobin

(H b O_{2})

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

Q. Capillaries exchange the following between blood and tissues:
(a) oxygen, carbon dioxide, nitrogen, plasma
(b) oxygen, carbon dioxide, food, wastes
(c) water, plasma, WBC, RBC
(d) oxygen, carbon dioxide, WBC, RBC

Q. (a) Draw a labelled diagram of human respiratory system.
(b) Explain the transportation of oxygen and carbon dioxide in human beings.

Q. Short / long answer type questions.
Describe the various ways by which carbon dioxide is transported by the blood from the tissues to the alveoli.

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