The Stomach

The Stomach

Page 3




· The mouth

· The stomach

· The small intestine

· The liver

· The large intestine

The Mouth

The beginning of the digestive tract

Food is chewed and broken into pieces that can be easily digested

Food is mixed with saliva to begin the process of breaking it down into a form that can be absorbed and used by the body

Saliva contains substances, including enzymes that initiate the process of breaking down food.

The Stomach

Holds food

Mixes and grinds food

Secretes acid and powerful enzymes to help break down food

Hydrochloric acids and enzymes are secreted by the lining of the stomach

The muscles of the stomach contact in a process called peristalsis to mix food with enzymes and acid

Food leaves the stomach in the form of a consistent liquid or paste

Small Intestines

Comprise three segments: The duodenum, Jejunum, ileum

The process of breaking down food is continued

The pancreas releases enzymes while the liver releases bile to help break down food

Bile aids the digestion of fat and eliminates waste products from the blood

The duodenum is largely responsible for breaking down of food while the jejunum and ileum are responsible for absorption of nutrients into the bloodstream

The Liver

The body’s chemical factory

Two main functions that fall within the digestive system are:

· Make and secrete bile

Bile contains bile acid required for the digestion and absorption of fats and fat-soluble vitamins in the small intestines

Many waste products are eliminated from the human body through secretion into bile

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