If you were given a piece of a cow's heart and told that it was one of the thicker-walled chambers,you would know that you had an atrium.

Name: If you were given a piece of a cow's heart and told that it was one of the thicker-walled chambers,you would know that you had an atrium.
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Question

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The ventricles must work harder and thus have more muscle, making their walls thicker than those of the atria.

If You Were Given a Piece of a Cow's Heart