Answers

2015-09-23T00:37:23+05:30
Because there is more pressure in ventricle than in auricles . to absorb the pressure the ventricles are thicker 
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2015-09-23T10:25:19+05:30
The ventricle pumps blood to the aorta, which then supplies  blood to all the parts in our body. Thus there is more pressure in ventricles than in auricles for pumping the blood.So, the walls of the ventricle are thicker than the auricle.
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