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42. The oxygen requirement in multicellular organisms cannot be met by diffusion because-
1) Diffusion is a slow process.
2) In multicellular organisms, the cells are not in direct contact with the outside environment as in unicellular organisms.
Therefore, in human beings, there are specialized tissues and organs that help to meet the oxygen requirements of the body.
43. Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not.
44. After a strenuous exercise muscles experience lack of oxygen. In the absence or insufficiency of oxygen, they respire anaerobically thereby producing lactic acid. The accumulation of lactic acid causes cramps in muscles.
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