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Why is diffusion insufficient to meet th...

Why is diffusion insufficient to meet the oxygen requirement of multicellular organisms like humans?

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Oxygen reaches only the exterior surface as a result of diffusion. Humans are huge enough so that the diffused oxygen cannot reach all the target cells within. Hence a separate respiratory system and circulatory system is essential.
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ZEN PUBLICATION-LIFE PROCESSES-ZEE ADDITIONAL QUESTIONS SECTIONS (LONG ANSWER [LA] TYPE QUESTIONS)
  1. Why is diffusion insufficient to meet the oxygen requirement of multic...

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  2. Explain the mechanism by which humans regulate their body temperature.

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  3. Why is nutrition necessary for the human body?

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  4. Discuss the main steps in the digestion of proteins as the food passes...

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  5. Compare length of the small intestine in herbivores and carnivores.

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  6. The approximate lengths of small intestine of animals x and y are give...

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  7. What will happen if mucus is not secreted by the gastric glands?

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  8. Name the organs that form the excretory system in human beings.

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  9. Describe in brief how urine is produced in human body.

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  10. Give reasons: a] Ventricles have thick muscular walls than atria. ...

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  11. What are the components of blood?

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  12. Name the veins which bring oxygenated blood to heart.

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  13. Write the function of valves present in between atria and ventricles.

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  14. Write one structural difference between the composition of artery and ...

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  15. Write the reaction that occurs when glucose breaks down anaerobically ...

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  16. Write the mechanism by which fishes breathe in water.

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  17. Name the balloon like structure present in the lungs. List its two fun...

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  18. Name the respiratory pigment in human beings. Where is this pigment fo...

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  19. Name the process and explain the type of nutrition found in green plan...

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  20. Write three events which occus during the process of photosynthesis.

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  21. Draw diagram to show the nutrition in amoeba and label the parts used ...

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