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Which are the three main layers that form the diffusion membrane?
(a)Thin squamous epithelium of alveoli, basement membrane of bronchioles and basement substance
(b)Thin squamous epithelium of alveoli, endothelium of alveolar capillaries and the basement substance
(c)Basement substance, cuboidal epithelium of alveoli and stratified epithelium of bronchiole
(d)Ciliated epithelium of trachea, endothelium of capillaries and basement substance

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Important Questions on Breathing and Exchange of Gases
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Which one of the following is not a character of respiratory surface?

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What is the percentage of transported in dissolved form through the plasma?

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How many molecules can bind with single molecule of ?

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To which part of , does bind?

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Which of the following condition is not responsible for shifting the oxygen dissociation curve towards left?

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Which factors favour the binding of $\mathrm{CO}_{2}$ with $\mathrm{Hb}$ in tissues?

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In mature mammalian erythrocytes, the respiration is:

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The amount of oxygen delivered to tissue by one litre of blood under strenuous condition is approximately
