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Explanation:
Avascular necrosis is basically the death of bone tissue due to a lack of blood supply. Also known as osteonecrosis, it can lead to tiny breaks in the bone and the bone's eventual collapse. A broken bone or dislocated joint can interrupt the blood flow to a section of bone.
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Because the heart has a very important task for the body, it follows a cycle called the cardiac cycle. The intervening pauses allows the blood to be emptied out completely from the atria and transferred to the ventricles before the ventricles finally pumps out the blood.
