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41. Write a note on respiration.

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42. Describe the respiratory quotient.

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43. Describe the types of respiration.

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44.

Give reasons for the following

Oxygen leaves the blood from tissue capillaries, but carbon dioxide enters the blood in tissue capillaries.

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45. Discuss the respiratory pigments of human beings.

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46.

How is respiration regulated ?

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47. Discuss the various ways in which animals obtain oxygen.

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48. List the causes of pneumothorax, haemothorax and pleural effusion.

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Conditions necessary for skin to act as respiratory organ are:

1. Skin must be smooth and without exoskeleton.

2. Skin must have lining of mucous cells to keep it moist.

3. Skin must be thin.

4. Skin must have a rich supply of blood.

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50.

On what factors does the rate of diffusion in the alveoli depend on?

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