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Digestive system/Cardio-respiratory System Assignment Normally, as food moves along the digestive tract, digestive juices and enzymes digest and absorb calories and nutrients. After we chew and swallow our food, it moves down the oesophagus to the stomach, where a strong acid continues the digestive process. The stomach is a sack-like portion of the digestive tract. Its inner surface is highly convoluted, enabling it to fold up when empty and open out like an expanding balloon as it fills with food. Thus while the human stomach has a volume of only about 50ml when empty, it may expand to contain 2 - 4 litres of food when full. Gastric bypass surgery promotes weight loss by closing off parts of the stomach to make it much smaller. To perform the surgery, doctors create a small pouch at the top of the stomach where food enters from the oesophagus. Initially, the pouch holds...

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