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The heart is enclosed in the thorax. That is in the rib cage. The thoracic and abdominal aorta is protected by the spine. You have one arm and thigh bone and one artery for each one. You have two forearm bones and two leg bones and two arteries. Only the common carotid arteries are not protected. Rather could not be protected. The carnivorous animals grab the front of the neck by instinct only. The arm and thigh arteries are placed medially to get the protection.

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8y ago

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