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Why will simple diffusion not meet the r...

Why will simple diffusion not meet the requirement of human beings ?

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All cells of the body are not in direct contact with the environment. In humans the energy requirement are high. Waste produced is more due to active metabolism. Therefore simple diffusion does not meet the oxygen requirements of human beings.
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CPC CAMBRIDGE PUBLICATION-LIFE PROCESSES-Additional Questions (Answer the Following Question)
  1. List the excretory system organs in human beings.

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  2. Name the enzymes present in saliva, gastric juice and pancreatic juice...

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  3. Write factors which affects the process of photosynthesis.

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  4. Why do the walls of the trachea not collapse when there is less air in...

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  5. What will happen to a plant if its xylem is removed ?

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  6. Mention how organisms like bread moulds and mushrooms obtain their foo...

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  7. Give one reason why multicellular organisms require special organs for...

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  8. Name the green dot like structures in some cell observed by a student ...

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  9. a) State the role of liver and pancreas. b) Name the organ which per...

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  10. Why will simple diffusion not meet the requirement of human beings ?

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  11. State the role and function of lymph in the human transport and system...

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  12. State the role of kidneys in humans

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  13. How are the alveoli designed to maximise the exchange of gases?

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  14. Describe the process of nutrition in Amoeba with the help of diagram.

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  15. Draw a diagram of the front view of human heart.

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  16. Draw a schematic representation of transport and exchange of oxygen an...

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  17. Draw a well labelled diagram of human alimenntary canal, and label the...

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  18. Describe the structure of human respiratory system.

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  19. Draw a neat diagram of excretory system of human beings and label the ...

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  20. Sketch and label the structure of nephron.

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