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The thorax is a division of an animal's body, that lies between the
head and the abdomen.
In humans, the thorax is the region of the body that extends from the
neck to the diaphragm, not including the upper limbs. The
heart and the lungs reside in the thoracic cavity, as well as many blood vessels. This area is protected by the
rib cage and the sternum.
The thorax is responsible for thoracic force which causes inhalation, and active
exhalation.
An insect's thorax is one of the three main segments of the creature's body. It is
the area to which the wings attach.
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