Midterm paper

MODULE 9 LO2 Histological Layers of Digestive Tract Dr. Lisa Brinn [email protected]

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2) Digestive Tract Layers • Mucosa

v Simple columnar epithelium v Stratified squamous epithelium v Organized into plicae

• Submucosa • Muscularis externa • Serosa

Peristalsis and Segmentation

Peristalsis Segmentation

Neural Control • Mechanoreceptors

v Mechanical stimuli • Chemoreceptors

v Chemical stimuli • Osmoreceptors

v Osmotic stimuli

Appropriate reflex ➙ digestion

Gland activation

Muscle stimulation

Hormonal Control • Gastrin • Secretin • Bicarbonate ions • Cholecystokinin (CCK) • Gastric inhibitory peptide

Secreted by endocrinocytes

Target organs