DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Blood vessels in the wall of the colon, pill camera view. The colon is the main part of the large intestine. The colon is primarily responsible for absorbing water from food, the nutrients have already been absorbed by the small intestine. The colon passes undigested matter to the rectum for excretion. A pill camera is a pill-sized camera that is swallowed to image the digestive tract.
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