Question

why are the walls of ventricle thicker than auricles​

Answer 1

The ventricles of the heart have thicker muscular walls than the atria. This is because blood is pumped out of the heart at greater pressure from these chambers compared to the atria. The left ventricle also has a thicker muscular wall than the right ventricle, as seen in the adjacent image

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Answer 2

Here is your answer user.