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Give biological reason for the following...

Give biological reason for the following:
The wall of the ventricle is thicker than the auricles,

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Ventricles have thicker wall than auricles because they are meant to pump blood with pressure to reach blood to larger distances.
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ICSE-SAMPLE QUESTION PAPER 3-SECTION-II
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  7. Explain the term root pressure.

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  9. Define the following Photophosphorylation.

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  12. The phase of cardiac cycle in which the auricles contract.

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  14. Name the following: The vein that carries oxygenated blood.

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