14. Where is the aorta?
The aorta is the big artery rising from the left side of the heart,
through which the blood passes on its way to all parts of the body
except the lungs, which are supplied blood by another system.
Starting from the heart, the aorta forms an arch, descending down
the left side of the body. It passes through the diaphragm into the
abdomen, where it divides into two lesser arteries.
One of these terminates under the end of the backbone, where the
coccyx is present.
The aorta is elastic, muscular and has three valves at its exit to
protect the heart from any back pressure that might develop in the
artery and force the blood in the wrong direction.
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