Flashcards in Digestion Deck (37):
1. Ingestion. 2. Motility 3. Secretion 4. Digestion 5. Absorption 6. Elimination of undigested materials.
Layers of alimentary canal
1. Mucosa 2. Sub mucosa 3. Muscularis 4. Serosa or aventitia
Epithelium: nonkeratinized stratified epithelium or simple columnar.
Lamina proprietary: loose CT ( areolar) that contain blood vessels.
Areolar ct with blood vessels, nerves, lymphatic vessels that serve organ.
Smooth muscles. Inner circular layer and outer longitudinal layer
Double layer serous membrane, surrounds stomach, small intestines, large intestines
Fibrous ct around mouth, pharynx, esophagus, and rectum.
Ct sheaths that hold stomach and intestines in place but allows for movement during digestion
Mechanorectors: detect stretch. Chemoreceptors: detect chemical concentrations
Long loop reflexes
Sensory info from receptors to CNS and motor output through facial, glossophyringeal or vagus nerves.
Short loop reflexes
Carried out by enteric nervous system, one organ will stimulate secretion or motility of another organ based on info from receptors
Mucosa is NK SSE. Aventitia contains intrinsic salivary glands which keep mouth wet.
Oral cavity accessory organs
Teeth, tongue extrinsic salivary glands
Names off extrinsic salivary glands
Sublingual, submandibular, and parotid salivary
Nasopharynx, ciliates pseudo stratified comlumnar.
Laryngo or oropharynx NK SSE
End at superior esophageal sphincter
Muscular funnel from superior to inferior esophageal sphincter .
Mucosa: NK Stratified SE
Sub mucosa. Contains elastic fibers
Muscular is contains skeletal muscles
Mucosa: simple squamous epithelium. Folds with submucosa to for, gastric ruggae or pits,
Muscular is has inner oblique layer.
Duodenum, jejunun, ileum
Mucosa: simple columnar cells and micro ills
Muscularis is shorter that other 2 layers, forming circular folds.
Cecum, ascending, transverse, descending, sigmoid colons, rectum and anal canal.
Mucosa: simple columnar epithelium
Right, left, caudate, quadrate lobes
Hepatic artery, hepatic portal vein, bile ductule
Blood through liver
Nutrient rich (O2 poor) blood enters lobule through branches of hepatic portal vein and mix with blood from hepatic artery. Blood mixes ands drains into hepatic veins that drain into IVC.
Hepatocyte clean blood and produce bile which drain into bile ductile, drain into left and right hepatic ducts to the commons hepatic ducts to custic ducts, to the gallbladder for storage,
3 tunics, mucosa, muscularis and serosa.
Secretes amylase, pancreatic lipase, proteases,nuclease.
Oral cavity motility
Voluntary phase of swallowing, tongue manipulates food, mixes with saliva and pushes along hard palate to form bolts, tongue pushes bolus back towards soft palate and oropharynx, this stimulates tactile receptors to move to next phase of swallowing,
Oral cavity secretion
Saliva. Salivary amylase and lingual lipase
Oral cavity digestion
Chemical: salivary amylase for carbs
Oral cavity absorption
Pharyngeal phase of swallowing, soft palate and uvula raise and block the nasopharyngeal. Epiglottis covers larynx. Superior esophageal sphincter relaxes.
esophageal phase. bolus pushed by peristaltic waves down esophagus. Peristalsis relaxes inferior esophageal sphincter and bolus enters stomach