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Infectious Diseases Affecting the GI Tract

Terms in this set (169)

eight main segments of the GI tract
mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, anus
four accessory organs of the GI tract
salivary glands, liver, gallbladder, pancreas
how does the stomach have antimicrobial properties?
low ph = high acid = antimicrobial
T or F: accessory organs have resident microorganisms
false
Functions of normal gut biota:
○ Protective function
○ Teach immune
system to react properly to microbial antigens
○ Aid digestion and provide nutrients
○ A diverse gut microbiome is
associated with health
defenses of oral cavity
Saliva, sIgA, lysozyme, tonsils, adenoids
normal biota of oral cavity
Prevotella, Treponema, Streptococcus, Actinomyces, Neisseria, Veillonella, Lactobacillus
defenses of the rest of GI tract
GALT, lymphoid tissue, Peyer's patches, appendix, sIgA, rich normal biota
normal biota of esophagus and stomach
Streptococcus, Staphylococcus, Clostridium, Bacillus
normal biota of large intestine
Bacteroides, Fusobacterium, Bifidobacterium, Clostridium, Streptococcus, Peptostreptococcus, Lactobacillus, Escherichia, Enterobacter, Candida and protozoa
main causes of dental caries
Streptococcus mutans and Streptococcus sobrinus
Dental Caries
○ Dissolution of the tooth surface due to the metabolic action of bacteria
○ Results in minor to complete disruption of enamel
○ Incidence varies according to
carbohydrate consumption, oral hygiene, and genetic factors
T or F: carbohydrats cause fermentation causing adhesion
true
causative organism of dental caries
a polymicrobial mixture of acid-producing bacteria
virulence factors of dental caries
adhesion, acid production
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