31.
Give reasons for the following :
Ventricles have thicker walls than auricles.
Ventricles have thicker walls than auricles because the ventricles have to pump blood to all the parts of the body. For this, they need to pump blood with greater force and thus require thick walls for the same.
The auricles have to pump blood to the ventricles only and thus do not require much force and have thin walls.
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