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41. Write a note on respiration.

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Respiratory quotient (R.Q.) : It is the ratio of the volume of carbon dioxide produced to the volume of oxygen used in a unit time.

It is different for different foods. For glucose, it is

For Fats it is about 0.7 and For proteins it is about 0.85.

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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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49. Write the conditions necessary for skin to act as respiratory organ.

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50.

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

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