Week 2 - Oral Cavity Flashcards

1
Q

Number of normal teeth

A

32

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2
Q

2 types of digestion in the oral cavity

A

Mechanical and chemical

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3
Q

How many large salivary glands are there in the oral cavity

A

3

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4
Q

How many litres of saliva is secreted a day

A

1-1.5L

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5
Q

Functions of saliva

A

Keeps oral cavity moist, suspension of food in solution that aids taste, begins digestion, protects

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6
Q

Two types of enzymes secreted in the oral cavity that help with digestion

A

Salivary amylase

Lingual lipase

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7
Q

Salivary amylase

A

Starch splitting enzyme which breaks down 3-5% of carbs

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8
Q

Lingual lipase

A

digests small amounts of lipids

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9
Q

An enzyme secreted to protect against bacteria

A

Lysozyme

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10
Q

Three parts of the Pharynx

A

Nasopharynx, oropharynx and Laryngopharynx

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11
Q

Which 2/3 parts of the pharynx are associated with digestion

A

Oropharynx and Laryngopharynx

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12
Q

Uvula/soft palate function

A

Stops food from entering nasopharynx

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13
Q

Epiglottis function

A

Prevents food from entering Larynx/wind pipe

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14
Q

Where is the Oesophagus located and how does it enter the diaphragm

A

Posterior to the trachea and enters the diaphragm through the hiatus (opening)

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15
Q

How is food controlled entering into the oesophagus

A

The upper and lower oesophageal sphincters

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16
Q

Phases of swallowing

A
  1. Voluntary phase
  2. Pharyngeal phase
  3. Oesophageal phase
17
Q

What gives the stomach its large surface area to stretch

A

Submucosa and mucosa are folded (rugae), which assists with increasing its surface area and expands the stomach when it receives food

18
Q

Stomach secretions

A

Mucous, hydrochloric acid, enzymes and hormones

19
Q

Name the stomach enzymes secreted and what they do

A

Gastric lipase - breaks down fats/lipids

Pepsin - breaks down protein

20
Q

Name the hormone secreted by the stomach and what it does

A

Gastrin - increases gastric secretions

21
Q

How does the body regulate stomach secretions (3 phases)

A

Cephalic phase, Gastric phase, Intestinal phase

22
Q

Cephalic phase - stimuli and PNS action potentials caused

A

Stimuli - smell or taste food, chewing and swallowing or even the thought of food
PNS - Secretion of stomach mucosa, Increases chief and parietal cell secretion, stimulates secretion of gastrin

23
Q

Gastric phase - stimuli and PNS action potentials caused

A

Stimuli - Enlargement of the stomach, presence of protein

PNS - similar to cephalic phase

24
Q

Intestinal phase

A

Chyme entering the duodenum triggers the enterogastric reflex and reduces gastric secretions

25
How long is the small intestine
~ 6 metres long
26
3 parts of the small intestine and their lengths
Duodenum (25cm) Jejunum (2.5m) Ileum (3.5m)
27
Where do most of the absorption occur in the small intestine
Jejunum
28
What hormones does the small intestine secrete and what do they do
Cholecystokinin and Secretin | They decrease gastric secretions and stimulate liver and pancrease secretions
29
What enzymes does the small intestine secrete and what do they do
Disaccharidases and peptidases | Assists the break down of food