-exposed to mechanical abrasion & substances from external environ
-can cause necrosis
GI tract
++ resistant to agents of injury d/t:
-antimicrobial agents
-epithelial mucosa
GI tract major categories of body injury?
-trauma
-physical
-chemical
-biological
GI tract responses
-inflammatory
-immunological
-neoplasms
Classification of upper GI tract disorders (3types)
-inflammatory/ infectious disorders
-diverticula & hernias
-neoplasms
Common GI disorder manifestations
-anorexia
-nausea
-vomiting
-GI bleeding
3 pairs of salivary glands
-parotid
-submandibular
-sublingual
Food in mouth stimulates
-chemoreceptors
-mechanoreceptors
Signals travel to pons & medulla via parasympathetic
-CN VII
-CN IX