General principles of alimentary tract secretion. Basic mechanism of secretion by glandular cells of organic substances, water and electrolytes COPY Flashcards
types of secretion - 1
SALIVARY GLANDS
- parotid gland secretes serous fluid
- submandibular gland secretes serous + mucosa fluid = mixed
- sublingual gland secretes mucosa fluid
types of secretion - 2
gastric secretions
- hcl
- instrinsic factor
- pepsinogen
- bicarbonate
- mucus
types of secretion - 3
pancreatic
- digestive enzymes to breakdown complex carbohydrates into simple sugars
- bicarbonate ions to neutralise stomach acids
types of secretion - 4
BILE
- produced by liver
- stored in gall bladder
bile emulsifies fats to breakdown into smaller globules so lipase has large SA to work on for faster ROR digestion
types of secretion - 5
INTESTINAL
- digestive enzymes like sucrase/ lipase/ maltase
- mucus/ bicarbonate ions to protect stomach lining
types of secretion - 6
defecation
- definition
- components
- mechanism
regulation of secretions - 1
NEURAL
- ENS
- SNS
- PNS
regulation of secretions - 2
HORMONES (5)
regulation of secretions - 3
mechanical
recoil + stretch of mechancoreceptors on stomach lining
regulation of secretions - 4
REFLEXES
enterogastric reflex
Basic mechanism of secretion by glandular cells of organic substances - 1
exocytosis
= bulk transport of molecules out of cell using vesicular transport
- using ATP
Basic mechanism of secretion by glandular cells of organic substances - 2
endocytosis
= bulk transport of molecules into cell using vesicular transport
Basic mechanism of secretion by glandular cells of water
osmosis
Basic mechanism of secretion by glandular cells of electrolytes - 1
na/k+ pump
Basic mechanism of secretion by glandular cells of electrolytes - 2
chloride/ bicarbonate pump
