salivary flow and constituents Flashcards
1
Q
describe the volume of saliva
A
- 500-1000ml/day
(90% from major salivary glands, 10% from minor salivary glands) - 0.3-0.5 ml/min at rest “unstimulated” flow rate
- 2-4ml/min when stimulated “stimulated” flow rate
2
Q
olfactory-salivary reflex
A
an olfactory-submandibular reflex does exist in humans
3
Q
describe types of salivary secretion
A
- serous (watery fluid)
mainly form parotid and submandibular glands - mucous (slime)
mainly from sublingual and minor glands
4
Q
Functions of saliva
A
- Protects tissue
- enhances taste
- lubricates food
- speeds up oral clearance of food
- facilitates removal of carbohydrates
- neutralises organic acids
- inhibits demineralisation
- enhances remineralisation
- recycles ingested fluoride to the mouth
- discourages microbial growth
- proteins sustain enamel surface
5
Q
composition of saliva
A
- H2O
- electrolytes/inorganic constituents
- formed elements/organic constituents
- hypotonic
6
Q
What is the buffering action of saliva
A
- Bicarbonate
- mainly from major glands
- concentration increases with flow rate
- minimises drop in pH around teeth after consumption of sugar/acids
- minimises demineralisation of teeth
- phosphate buffers
- protein buffers
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