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digestive system > Secretion of saliva. Characteristics and function of saliva. Regulation of salivary secretion > Flashcards

Secretion of saliva. Characteristics and function of saliva. Regulation of salivary secretion Flashcards

1
Q

secretion of saliva - 1

A

parotid gland
- located near ears
- produce serous saliva

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2
Q

secretion of saliva - 2

A

submandibular gland

located under jaw
produces serous/ mucous saliva

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3
Q

secretion of saliva - 3

A

sublingual gland

located under tongue
produces mucus saliva

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4
Q

characteristics of saliva - 1a

A

COMPOSITION

  • water = 99%
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5
Q

characteristics of saliva - 1b

A
  • antimicrobial proteins that protect mouth from pathogens
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6
Q

characteristics of saliva - 1c

A
  • glycoprotein mucin for viscosity/ lubrication
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7
Q

characteristics of saliva - 1d

A

enzymes
- amylase: starch -> smaller sugars

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8
Q

characteristics of saliva - 1e

A
  • electrolytes - sodium/ calcium/ potassium/ bicarbonate/ phosphate
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9
Q

characteristics of saliva - 1f

A

organic molecules - urea/ uric acid/ glucose

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10
Q

characteristics of saliva - 2

A

pH

6.2 to 7.6

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11
Q

function - 1

A

DIGESTION

  • mechanical digestion
  • amylase: starch -> simple sugars
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12
Q

function - 2

A

PROTECTION

bicarbonate ions in saliva neutralise acidic nature of saliva to prevent erosion

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13
Q

function - 3

A

ANTIMICROBIAL ACTION

lactoferrin - binds to iron so pathogens cannot

lysosome - digestive hydrolytic enzyme to breakdown bacterial cell walls

IgA - neutralising pathogens

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14
Q

function - 4

A

REMODELLING

saliva contains calcium and phosphate ions to remodel tooth

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15
Q

function - 5

A

TASTE

interacts with taste receptors on tongue

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16
Q

function - 6

A

HYGEINE

removal of debris to back of mouth to be swallowed into stomach acid

17
Q

function 7

A

speech
having enough saliva allows not dry mouth so you can speak

18
Q

Regulation of saliva secretion - 1

A

PNS

  • activated when smelling/ thinking/ seeing food
  • signals sent to salivary glands in pons/ medulla
  • signals sent to facial nerve + glossopharyngeal nerve
  • Ach released to bind to M receptors on salivary glands = saliva produced
19
Q

Regulation of saliva secretion - 2

A

SNS

  • activated by fight or flight
  • less saliva produced
20
Q

Regulation of saliva secretion - 3

A

HORMONAL

  • estrogen + progesterone increase salivary production in pregnant women
21
Q

Regulation of saliva secretion - 4

A

cephalic reflec

= sight/ smell/ thought of food = saliva production

22
Q

Regulation of saliva secretion - 5

A

gustatory reflex

= tasting food directly stimulates saliva production

23
Q

Regulation of saliva secretion - 6

A

masticatory reflex = chewing food stimulates saliva production by sensory receptors in mouth sending signals to brain

digestive system (14 decks)

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