Digestive System Essay

Digestive System Essay-19
Known as the peristalsis, these contractions, which occur throughout the alimentary canal, squeeze the food through the 25 centimeters of the esophagus.

Known as the peristalsis, these contractions, which occur throughout the alimentary canal, squeeze the food through the 25 centimeters of the esophagus.

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The digestive system uses mechanical and chemical activities to break food down into absorbable substances during its journey through the digestive system.

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.

Even in astronauts, food passes through the esophagus into the weightlessness of space.

The reason is that food is moved along by contractions of smooth muscle surrounding the esophagus.The human digestive system, like those of other vertebrates, is built around an alimentary canal - a one way tube that passes through the body.The function of the digestive system is to convert foods into simple molecules that can be absorbed and used by the cells of the body.Note the route of non-fat nutrients from the small intestine to their release as nutrients to the body.The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation.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.First, our tongue helps to push food into the back of our throat.Then there are special throat muscles that force the food down into a long tube that leads to our stomach, called the esophagus.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.

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