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The large intestine's main job is to remove water from the undigested matter and form solid waste (poop) to be excreted.The Digestive System The digestive system is a group of organs that perform the process by which food, containing nutrients, is eaten and broken down into different components.
At the end of the esophagus, a muscular ring or valve called a sphincter (pronounced: SFINK-ter) allows food to enter the stomach and then squeezes shut to keep food or fluid from flowing back up into the esophagus.
The stomach muscles churn and mix the food with digestive juices that have acids and enzymes, breaking it into much smaller, digestible pieces.
The first step of digestion begins at the mouth, where the food enters the mouth. The saliva contains enzymes such as Ptyalin, which starts sugar digestion. “Digestive System.” World Book Multimedia Encyclopedia.
The enzymes also provide lubrication to help in the chewing and swallowing of the food.
The inner wall of the small intestine is covered with millions of microscopic, finger-like projections called villi (pronounced: VIH-lie).
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The villi are the vehicles through which nutrients can be absorbed into the blood.
The first step in the digestive process happens before we even taste food.
Just by smelling that homemade apple pie or thinking about how delicious that ripe tomato is going to be, you start salivating — and the digestive process begins in preparation for that first bite.
The alimentary canal is the long tube of organs — including the esophagus, stomach, and intestines — that runs from the mouth to the anus.
An adult's digestive tract is about 30 feet (about 9 meters) long.