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BLOOD-The definition of blood is the fluid that carries oxygen and other elements to the tissues and carbon dioxide away from the tissues through the heart and vascular system of humans and other animals. An example of blood is the red fluid that comes out of a person when he gets cut.
ESOPHAGUS-The esophagus is a muscular tube connecting the throat (pharynx) with the stomach. The esophagus is about 8 inches long, and is lined by moist pink tissue called mucosa. The esophagus runs behind the windpipe (trachea) and heart, and in front of the spine
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