why is the herd divided into two halves by a thick wall
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To prevent the mixture of oxygenated and deoxygenated blood from the halves.It has the the thick wall called called septum.
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Hope it helps you!
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The interior of the heart has left and right side separated by a thick muscular wall called septum. Each side has an upper chamber atrium and a lower chamber called ventricle divided by valves. Atrias are smaller than the ventricles and their walls are thinner.
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