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digestive system-1
The digestive system
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Slide 1:
Diapositive
Biologie
Middelbare school
havo, vwo
Leerjaar 2
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The digestive system
Slide 1 - Diapositive
1
2
3
4
5
6
7
8
heart
large intestine
small intestine
stomach
lung
liver
brain
kidney
Slide 2 - Question de remorquage
Digestion
Digestion:
Breakdown of food molecules into small food molecules
When food is digested it is absorbed
Slide 3 - Diapositive
Big vs. Small
Big molecules
-> Insoluble can not get through the gut wall
Small molecules
-> Soluble can get through the gut wall
Slide 4 - Diapositive
Fases of digestion. Put them in the right order.
1
2
3
4
digestion
ingestion
absorption
egestion
Slide 5 - Question de remorquage
FASES OF DIGESTION:
INGESTION
CHEMICAL AND MECHANICAL DIGESTION
ABSORPTION
EGESTION
Slide 6 - Diapositive
CHEMICAL DIGESTION:
BREAKING THE FOOD INTO EVEN SMALLER MOLECULES.
USING
ENZYMES
TO BREAK DOWN THE FOOD MOLECULES.
Slide 7 - Diapositive
Chemical digestion
Enzymes: Important chemicals
Slide 8 - Diapositive
Work
Go to classroom and follow the link 'draw a model of the digestive system'.
Draw the organs of the digestive system
label the parts
add the functions
Slide 9 - Diapositive
Chemical digestion Step 1
starts in: the mouth
the enzyme: amylase (a carbohydrase)
the liquid: saliva
the nutrient: carbohydrates
the products: glucose
The enzymes in your saliva start breaking down the carbohydrate molecules into glucose.
Slide 10 - Diapositive
Down the tube!
Oesophagus
Peristalsis: moving food down your oesaphagus (gullet)
Slide 11 - Diapositive
Why is your stomach rumbling?
-peristalsis, muscle activity
- mechanical digestion
-Empty stomach and intestines make a louder sound!
Slide 12 - Diapositive
In your stomach
Digestive juices are added
Proteases
-> digestion proteins -> amino acids
Hydrochloric acid
-> acid PH, best for the enzymes + acidic environment also kills germs
Rennin
(only babies) makes milk solid, stays in the stomach longer
Slide 13 - Diapositive
small intestine
Slide 14 - Diapositive
In your small intestine
2 important liquids added in the first part (the duodenum)
Pancreatic juice
(carbohydrases, proteases and lipases)
Bile
from the liver, stored in the gall bladder
Bile is alkaline neutralises acid from the stomach
Bile emulsifies fats, increases surface area of fats lipase enzymes to act upon
Slide 15 - Diapositive
In your small intestine
Intestinal juice
(carbohydrases, proteases, lipases) Complete digestion of food, made by the wall of the small intestine
Slide 16 - Diapositive
Slide 17 - Vidéo
Ingestion
Mechanical digestion
Chemical digestion
MOVING THE FOOD INTO YOUR MOUTH
BREAKING THE FOOD INTO SMALLER PIECES.
THIS IS DONE BY YOUR TEETH
BREAKING THE FOOD INTO EVEN SMALLER PIECES.
USING ENZYMES TO BREAK DOWN THE FOOD MOLECULES.
Slide 18 - Question de remorquage
Amylase is an example of a
A
Carbohydrase
B
Lipase
C
Protease
Slide 19 - Quiz
During the break down of proteins you get:
A
glucose
B
amino acids
C
fatty acids
Slide 20 - Quiz
The environment of the stomach is
A
Acidic
B
Alkaline
Slide 21 - Quiz
Work
Read pages 54-58
Do questions digestive system#1 on classroom
Hand in your food diary OR lab report about food tests next lesson.
Slide 22 - Diapositive
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