Gastric emptying and absorption

1
Gastric emptying and absorption

• GI tract
• Digestion
• Gastric emptying
• Intestinal absorption
• GI problems

2
Digestion

• Mouth - chewing, saliva
• Pharynx
• Oesophagus- peristalsis
• Stomach - storage, mixing, gastric emptying
• Small intestine-duodenum, jejunum, ileum
• Large intestine - bacteria

3
(No Transcript)
4
(No Transcript)
5
(No Transcript)
6
Enzymes

• Enzymes are proteins
• Catalyse specific chemical reactions
• Increase rate of reaction without undergoing
  change itself

7
Specificity Lock and key theory
Active site
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
Factors affecting gastric emptying

• Particle size
• Osmolality
• Energy density
• Protein, fat
• Type of CHO
• Acidity
• Meal temperature
• Meal volume
• Dietary fibre
• Hormones

12
(No Transcript)
13
Exercise intensity

• Below 70-75VO2 max no effect
• Above 75 VO2 max GE reduced but by a very small
  amount

14
(No Transcript)
15
Type of exercise

• No effect on GE of the type of exercise has been
  observed
• Type of exercise may be related to GI complaints

16
Dehydration

• Dehydration and hyperthermia reduce gastric
  emptying
• This may be related to GI complaints
• It is not known if the complaints are a result or
  the cause of the reduced GE

17
(No Transcript)
18
(No Transcript)
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
Osmolality

• Refers to the concentration of particles in
  solution.

27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
(No Transcript)
31
(No Transcript)
32
(No Transcript)
33
(No Transcript)
34
(No Transcript)
35
(No Transcript)
36
(No Transcript)
37
(No Transcript)
38
(No Transcript)
39
(No Transcript)
40
(No Transcript)
41
(No Transcript)
42
(No Transcript)
43
(No Transcript)
44
(No Transcript)
45
(No Transcript)
46
(No Transcript)