The digestive system is the series of tubelike organs that convert our meals into body fuel. There are about 30 feet (9 meters ... of the small intestine, the duodenum, produces large quantities ...

The small intestine is well adapted for digestion: it has thin walls, making it easy for food molecules to pass through into the blood stream. The last stage of digestion involves the large ...

The small intestine is well adapted for digestion: it has thin walls, making it easy for food molecules to pass through into the blood stream. The last stage of digestion involves the large ...