Chapter 23: Lecture 1
Structures of the Digestive System
GI tract
processes food into nutrients, absorbs nutrients, eliminates what it doesn't need
most GI tract organs protected by peritoneum
The GI tract
mouth
esophagus
small intestine
colon
rectum and anus
Accessory Digestive Organs
tongue and teeth masticate food
enamel covers the teeth
dentin is the softer body of the tooth
gingiva are the gums and body of the jaw
pulp is where the blood vessels and nerves are
salivary glands lubricate for swallowing
liver makes bile to aid in digestion
gallbladder emulsifies fats
Microbiome of the Digestive System
esophagus, stomach, duodenum
free of microbes
peristalsis prevents transportation
700 species in oral biofilms
viridans strep most prevalent in this region
Dental Caries, Gingivitis, Periodontal Disease
caries, tooth decay, cavities, holes, pits in teeth
periodontal disease- gums swollen, tender, bright red, bleeding
trench mouth- acute necrotizing ulcerative gingivitis
dextran- insoluble sticky slime
tarter- fermented plaque
perphyromonas gingivalis causes periodontal disease
high sugar diet, citric acid, snacking, plaque buildup, misaligned teeth, rough edges to fillings, pregnancy, birth control pills, lead poisoning
Peptic Ulcer
helicobacter pylori
bacterial gastroenteritis
e. coli
contaminated food and water and poor living conditions
Shigellosis
fever, abdominal cramps, diarrhea, bloody stools
type III secretion system