Human digestive system

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Page 1: Human digestive system



Page 2: Human digestive system

The food that we eat is mostly solid form. Before it can be used by the body, it must

first be turned into a soluble form. It means that the food must be broken down into a liquid form of every tiny particles. It is only this form that the

nutrients can be absorbed by the blood stream and carried to the various parts of

the body.

This is the job of the digestive system.

Page 3: Human digestive system

MOUTHThe mouth is the beginning of the digestive tract. In fact, digestion starts here as soon as you take the first bite of a meal. Chewing breaks the food into pieces that are more easily digested, while saliva mixes with food to begin the process of breaking it down into a form your body can absorb and use.

Page 4: Human digestive system

THROATAlso called the pharynx, the throat is the next destination for food you've eaten. From here, food travels to the esophagus or swallowing tube.

Page 5: Human digestive system


The esophagus is a muscular tube extending from the pharynx to the stomach. By means of a series of contractions, called peristalsis, the esophagus delivers food to the stomach. Just before the connection to the stomach there is a "zone of high pressure," called the lower esophageal sphincter; this is a "valve" meant to keep food from passing backwards into the esophagus.

Page 6: Human digestive system

STOMACHThe stomach is a sac-like organ with strong muscular walls. In addition to holding the food, it's also a mixer and grinder. The stomach secretes acid and powerful enzymes that continue the process of breaking down the food. When it leaves the stomach, food is the consistency of a liquid or paste.

Page 7: Human digestive system

Small IntestineThe small intestine loops back and forth upon itself so much so that it can fit into the abdominal space it occupies. It is held in place by tissues that are attached to the abdominal wall and measures eighteen to twenty-three feet in the average adult, which makes it about four times longer than the person is tall.

Page 8: Human digestive system

Large Intestine

The large intestine takes care of absorbing any water left in the food that hasn’t been digested yet, and then passing any unused waste from the body. It is one of the final portions of the digestive system.

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PANCREASAmong other functions, the oblong pancreas secretes enzymes into the small intestine. These enzymes break down protein, fat, and carbohydrates from the food we eat.

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LIVERThe liver has many functions, but two of its main functions within the digestive system are to make and secrete bile, and to cleanse and purify the blood coming from the small intestine containing the nutrients just absorbed.

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GallbladderThe gallbladder is a pear-shaped reservoir that sits just under the liver and stores bile. Bile is made in the liver then travels to the gallbladder through a channel called the cystic duct.

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