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
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2
Q

olfactory-salivary reflex

A

an olfactory-submandibular reflex does exist in humans

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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
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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
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5
Q

composition of saliva

A
  • H2O
  • electrolytes/inorganic constituents
  • formed elements/organic constituents
  • hypotonic
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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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7
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8
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9
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10
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11
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12
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13
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14
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15
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