The heart is divided into four chambers. The upper two chambers are called auricles; the lower two are called ventricles. Each auricle is connected with the ventricle below it by a valve that allows blood to flovv from the auricle to the ventricle, but not in the opposite direction.
The heart also contains a, network of nerves that naturally regulates the pumping operation.
One of the wonders of modern surgery is the heart trans pIant,first demonstrated to be operationally feasible in humans by Dr. Christiaan Barnard. By this means, the deteriorated heart of a patient who would otherwise not have long to live may be physically replaced by the healthy hear of a person who has just died, Several people have been able to resume normal lives,thanks to this medical miracle.
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