Digestive System sullivan anatomy
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- Digestive System
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All living cells need energy to function
Humans Derive energy by consuming organic molecules(food)
Digestive tract prepares food for cellular utilization by: chemical and mechanical digestion - Specific processes of Digestive system
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Ingestion
Mechanical processing
Digestion
Secretion
Absorption
Compaction
Excretion - DS Anatomically and functionally divided into:
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GI tract (alimentary canal)
Accessory organs - Histology of tract
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Mucosa
Submucosa
Muscularis
Serosa - Mucosa
- simple columnar epithelium (except mouth, phaynx, esophagus,anal canal).
- Submucosa
- Areolar connective tissue (vascular)
- Muscularis
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2 layers of smooth muscle..... muscle inner....circular
outer....longitudinal - Serusa
- visceral peritoneum areolar connective tissueover simple squamous epithelium
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GI Tract
Mouth -
From lips to oropharynx
Roof bony hard palete anteriorly and muscular soft palete posteriorly
Muscular uvula hangs down from posterior part of soft palete -
GI Tract
Tongue -
Floor of mouth, Lingual frenulum
Mucous membrans over skeletal muscle(chew, swallow, speech, taste buds)
Extrinsic muscles....move tongue
Intrinsic muscles...change shape and size
Both innervated by cranial nerve 12(hypoglossal)