Digestive Tract I Flow Chart PDF

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Summary

SUMMARY OF THE DIGESTIVE TRACT...

Description

Digestive System I: The Digestive Tract

Digestive Tract and Accessory Digestive Glands

Digestion and Absorption

Located in Abdominopelvic Cavity

Lined by Parietal Peritoneum

Organs Covered by Visceral Peritoneum

Peritoneal Cavity is between the Two Membranes

Functions

Ingestion

Secretion

Motility

Food and liquid take in

Acid, Buffers, Enzymes

Mixing and Moving Food

Digestion

Absorption

Elimination

Chemical (acid and enzymes)

Mechanical (teeth and tongue)

GI Tract

Oral Cavity

Teeth, Tongue, Salivary Glands

Fragment and Hydrate

Pharynx

Swallowing

Esophagus

Stomach

Small Intestine

Large Intestine

Initiates Digestion

Digestion and Absorption

Compaction and Storage

Oral Cavity

Tongue

Moves in different directions because of skeletal muscles

Positions food

Teeth

Organ of Speech

Sensory Organ

Temperature

Deciduous Dentition (20)

Permanent Dentition (32)

Mastication

Taste

Esophagus

Pharynx to Stomach

Along Mediastinum and through Diaphragm

Lined by Stratified Squamous NonKeratinized Epithelium

Upper portion: Skeletal Muscle (Voluntary)

Lower portion: Smooth Muscle (Involuntary)

Continue Swallowing or Bring Food Back

Committed to finish Swallowing

Neutralization of Chyme

Stomach

pH Dig

Mechanical Digestion

Chemical Digestion

Forms Chyme

Contractions

Secreted Acids and Enzymes

Food + G pH of chyme in Juice stomach: 1-2

Released from the Stomach by Pyloric Sphincter

Enzymes in have alkalin pH optimum

Enters Duodenum, Neutralized by:

Alkaline secretions from the pancreas

Brunner's G

Gastric Gland Cells

Surface Mucus

Mucus Neck

Alkaline Mucus

Protective

Parietal

HCl

Intrinsic Factor (Vitamin B12)

Alkaline mu secreted submucosal g of the duode

Chief

Enteroendocrine

Secrete Pepsinogen (Converted to Pepsin by S.A.)

Secrete Hormones

G Cells- Gastrin-secretion of parietal and chief cells

Small Intestine

Jejunum

Duodenum

Short

Receives chyme

Absorptive Surface Area of Small Intestine

Surface Area increased by Vi and Microvilli

Projections/folds on the surface of the small intestine

Receives secretions of pancreas and gall bladder

Ileum

Majority of digestion and absorption takes place

Digestion and Absorption completes

Empties into large intestine

Large Intestine

Reabsorbs water and electrolytes

Absorbs vitamins produced by colonic bacteria

Comparison of Mucosa

Compacts and Stores Feces

Vitamin K and Vitamin B12

Stomach

Secretory

Small Intestine

Absorptive

Secretory

Large Intestine

Absorptive

Secretory...