The Alimentary Tract

Июль 22, 2022

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The Alimentary Tract

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2. PLAN The Alimentary Tract Mouth Esophagus Small Intestine Large Intestine
3. The Alimentary Tract A long muscular tube with many sections and areas. Begins with the mouth
4. The Alimentary tract Mouth Pharynx Esophagus Stomach Small Intestine Large Intestine Anus
5. Mouth Functions: Food enters in the mouth or oral cavity Tasting Mechanical breakdown of food Secretion
6. Mouth Structures in the mouth that aids digestion: Teeth – cut, tear, crush and grind food.
7. Esophagus A straight muscular tube that is about 10 inches (25 cm) long which connects the
9. Small Intestine Long (20 ft), coiled tube beneath the stomach. Has three parts: Duodenum – upper
10. Large Intestine a.k.a. Colon larger diameter, but shorter (5 ft)Water is absorbed from the undigested food
11. Large Intestine Waste is pushed into the expanded portion (rectum) of the large intestine. Solid waste
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PLAN
The Alimentary Tract
Mouth
Esophagus
Small Intestine
Large Intestine

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The Alimentary Tract
A long muscular tube with many sections and

areas.
Begins with the mouth and ends with the anus.

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The Alimentary tract
Mouth
Pharynx
Esophagus
Stomach
Small Intestine
Large Intestine
Anus

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Mouth
Functions:
Food enters in the mouth or oral cavity
Tasting
Mechanical

breakdown of food
Secretion of salivary glands (salivary amylase).

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Mouth
Structures in the mouth that aids digestion:
Teeth – cut,

tear, crush and grind food.
Salivary glands – produce and secrete saliva into the oral cavity.

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Esophagus
A straight muscular tube that is about 10 inches

(25 cm) long which connects the mouth with the stomach
Food takes about 4 to 8 seconds as it passes through to the stomach.
Its walls contain smooth muscles that contracts in wavy motion (Peristalsis).
Peristalsis propels food and liquid slowly down the esophagus into the stomach.
.Cardiac Sphincter (ring-like valve) relaxes to allow food into the stomach.

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Small Intestine
Long (20 ft), coiled tube beneath the stomach.
Has three

parts:
Duodenum – upper part; about 10 in; connected to the stomach.– where the digestive juices from the pancreas and the liver combine with chyme making it thin and watery.
Jejunum – about 8
ftIleum – about 12 ft

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Large Intestine
a.k.a. Colon larger diameter, but shorter (5 ft)Water is

absorbed from the undigested food making the waste harder until it becomes solid.Waste stays for 10 – 12 hours.

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Large Intestine
Waste is pushed into the expanded portion (rectum) of the

large intestine.
Solid waste stays in the rectum until it is excreted through the anus as feces.
Appendix hangs on the right side of the large intestine.