Biology
The ventricles have thick muscular walls whereas the auricles have thin walls. Why do you think thick muscular walls are necessary in the ventricles and not in the auricles.
Circulatory System
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Answer
The Auricles have to receive blood and transfer it to the ventricles for which they do not require much force. So, they have thin walls. But the ventricles have thick walls because they need more force as they have to pump the blood out of the heart at greater pressure to the lungs (Right ventricle) and whole body (Left ventricle).
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