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

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The rate of diffusion depends on the following factors:

i. Partial pressure gradients of O₂ (pO₂) and CO₂ (pCO₂),

ii. Solubility of the gases.

iii. Thickness of the diffusion surface.

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