Digestive System- 7th Grade

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Stomach

Most mechanical digestion occurs here. This muscular organ churns the food and adds fluids that break it down. The combination of acids, fluids, and enzymes turn good into a thick liquid called chime.

Small Intestine

Most chemical digestion and absorption occurs in this organ. Enzymes and chemicals from the liver and pancreas work with enzymes created by this organ to chemically digest food and absorb nutrients.

Large Intestine

The organ contains healthy bacteria that feed on the material passing through and help make vitamins. This organ also absorbs water from the digesting food.

Salivary Gland

This produces a fluid that moistens the food in your mouth into a slippery mass and has enzymes that break down starches.

Epiglottis

This flap of tissue seals off the windpipe so that food can go down the esophagus, not the windpipe.

Villi

The tiny finger-shaped structures that line the small intestine and absorb nutrients into the bloodstream.

Esophagus

This mucus coated tube connects the mouth to the stomach.

Gall Bladder

This organ is a small sack that stores bile until it is needed. As bile is needed to break down fats, it is dumped into the small intestine from this organ.

Liver

This is the largest internal organ. It has functions in multiple body systems. In the digestive system, it produces bile, which is a chemical that breaks up fat particles.

Mouth

Mechanical and chemical digestion begins here. Chewing and mashing the food is mechanical digestion. The enzymes in saliva begin chemical digestion.

Pancreas

Food does not pass through this organ. It produces many enzymes that flow into the small intestine and help beak down starches, proteins, and fats.

Rectum

This short tube is the last section of the large intestine. Waste material is collected here and compressed into a solid form. The waste material is eliminated from the body through the anus.

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