chap 02_2-3
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Human Digestive System
Digestive system
Chapter
2.3
mouth
rectum
liver
gall bladder
large intestine
small intestine
pancreas
stomach
oesophagus
salivary glands
anus
duodenum
1
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Digestion start hereTeeth chewed and breakdown the food into small piecesSalivary amylase changes starch into maltose (complex sugar)starch
maltose
salivary amylase
Mouth
2
Physical Digestion Stage
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
The salivary gland secretes saliva that is alkaline and contains salivary amylaseenzymes
Salivary gland
3
Chemical Digestion Stage
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Food passes through the oesophagus into the stomach by peristalsisNo digestion takes place in the oesophagusOesophagus
4
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Food is mixed with gastric juice Gastric juices containhydrochloric acidHydrochloric acid helps tokills bacteriaprovide an acidic medium for enzymes to take actionneutralize and stop the action of salivary amylase enzymesPepsin changes protein into peptonesRennin coagulates milk in the stomachto help in the enzymic action of pepsin
protein
peptones
pepsin
liquid milk
protein
solid milk
protein
rennin
enzymes pepsin and renninStomach
5
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
The first part of the small intestineReceives pancreatic juice and bilePancreatic amylase changesstarch into maltose
Pancreatic protease changespeptones into amino acid
Pancreatic lipase changes fatinto fatty acid and glycerol
The bile breaks down fats into small droplets for enzymic actionstarch
maltose
pancreatic amylase
peptones
amino acids
pancreatic
protease
fat
fatty acid + glycerol
pancreatic
lipase
Duodenum
6
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Produces bile and stored in the gall bladder before it is flows into theduodenum through the bile duct
Bile helps to prepared an alkaline medium for enzymic actionLiver
7
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Produces pancreatic juice that contains three types of enzymespancreatic amylaseproteaselipasePancreas
8
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
The small intestine produces enzymes which changes maltose into glucoseDigestion is completed in hereThe nutrients is absorbed through the thin walls of the small intestine into thebloodstream
Small intestine
9
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Water is reabsorbed hereUndigested and unabsorbed food goes to rectumLarge intestine
10
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Undigested and unabsorbed food forms a semi solid waste called faecesTemporarily stored the faecesRectum
11
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Chapter
2.3
Human Digestive System
Excreted the faeces out of the bodyAnus
12
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
-
Quick Refresh
Digestion is the process of breaking down complex food into simple diffusible molecules that can be absorbed by the body
Enzymes are proteins which speed up the process of digestion
Alimentary canal is the path of the food passes through the digestive system. It start from mouth, oesophagus, stomach, small intestine, large intestine, and ends at the anus
Process of peristalsis is the movement of food by the muscular walls that contract and expand alternately along the alimentary canal
As a result of digestion
Q.R.
2.3
Class of food
Final product
Carbohydrate
Glucose
13
Protein
Amino acid
Fat
Fatty and glycerol
Amazing Tunas Enterprise (001573407-U)
TRG Science Form 2
Chapter 2 : Nutrition
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