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The human digestive system, like those of other vertebrates, is built around an alimentary canal - a one way tube that passes through the body.
Chewing - Chewing is the first stage of the digestive system.
When you chew your food it breaks up big pieces into little pieces that are easier to digest and swallow. It has special enzymes in it that start to break down starchy food (potatoes, bread) while you chew. Swallowing - Swallowing may seem like a simple process to us. But food doesn't just fall down our throats into our stomach.
A thick ring of muscle, known as the cardiac sphincter, closes the esophagus after food has passed into the stomach, preventing the contents of the stomach from moving back into the esophagus.
The size of the stomach enables you to eat a few large meals a day, rather than having a nibble at a time.
The entire length of our digestive system is around 20 to 30 feet!
Here are the major stages of the digestive system: 1.Known as the peristalsis, these contractions, which occur throughout the alimentary canal, squeeze the food through the 25 centimeters of the esophagus.Food from the esophagus empties into a large muscular sac called the stomach.The surfaces of the teeth, which are much tougher than ordinary bone, are protected by a coating of mineralized enamel. After the bolus is swallowed, it passes through the esophagus, or food tube, into the stomach.Did you know that food can travel through the esophagus whether you're sitting up, lying down, or standing on your head.Food enters the mouth, where the work of the digestive system begins.Chewing, which takes place in the mouth, seems simple enough - teeth tear and crush the moistened food to a fine paste until it is ready to be swallowed. Teeth are anchored in the bones of the jaw by a network of blood vessels and nerves that enter through the roots of the teeth.Any food that the body doesn't need or can't use is sent to the large intestine and later leaves the body as waste.The Liver and Pancreas The liver and pancreas do a lot to help the digestive system along. The liver provides bile (stored in the gall bladder) that helps break up fat into smaller bits.The food doesn't just fall down the pipe, muscles push the food along until it gets to our stomach.At the same time all this is going on, a flap blocks off our windpipe making sure food doesn't go the wrong way.