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Respiration and Circulation — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYRespiration and Circulation3 Marks
Question
Why do large animals cannot carry out respiration without the help of circulatory system?
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Answer

  1. Large animals have various organ systems which always work in a coordinated manner.
  2. These animals provide large respiratory surfaces (numerous alveoli) for the exchange of gases. But these respiratory gases must be carried to the cells of tissues which are away from the respiratory surfaces.
  3. To carry these gases to tissues, there is need of transport system. These gasses are transported from respiratory surfaces to the cells of tissues through blood as a transporting medium.
  4. Therefore, large animals cannot carry out respiration without the help of circulatory system.

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