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digestive system-1
The digestive system
kerboodle pages 54-58
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Slide 1:
Tekstslide
Biologie
Middelbare school
havo, vwo
Leerjaar 2
In deze les zitten
30 slides
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Lesduur is:
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The digestive system
kerboodle pages 54-58
Slide 1 - Tekstslide
1
2
3
4
5
6
7
8
heart
large intestine
small intestine
stomach
lung
liver
brain
kidney
Slide 2 - Sleepvraag
Digestion
Digestion:
Breakdown of food molecules into small food molecules
When food is digested it is absorbed
Slide 3 - Tekstslide
Big vs. Small
Big molecules
-> Insoluble can not get through the gut wall
Small molecules
-> Soluble can get through the gut wall
Slide 4 - Tekstslide
MECHANICAL DIGESTION:
BREAKING THE FOOD INTO SMALLER PIECES.
THIS IS DONE BY YOUR TEETH
BITING AND CHEWING
Slide 5 - Tekstslide
Slide 6 - Tekstslide
Why chew?
Digestive juices need to digest nutrients
Chewing makes the surface area
bigger
Slide 7 - Tekstslide
CHEMICAL DIGESTION:
BREAKING THE FOOD INTO EVEN SMALLER MOLECULES.
USING
ENZYMES
TO BREAK DOWN THE FOOD MOLECULES.
Slide 8 - Tekstslide
enzymes
substrate is broken down
Slide 9 - Tekstslide
Slide 10 - Tekstslide
Slide 11 - Tekstslide
What is peristalsis?
A
muscle movement to push food down the gut
B
making smaller droplets of fats
C
movement of nutrients into the circulatory system
Slide 12 - Quizvraag
Which limiting factor is directly connected to the enzymes?
A
sunlight
B
temperature
C
water
D
carbon dioxide
Slide 13 - Quizvraag
Breaking of large molecules into smaller molecules is called
A
chemical digestion
B
mechanical digestion
Slide 14 - Quizvraag
Digestion is
A
Making nutrients smaller
B
Making poop out of food
C
Making food smaller
D
Changing food into something we cannot use
Slide 15 - Quizvraag
The digestion of starch starts in the ...
A
Mouth
B
Stomach
C
Duodenum
D
Small intestine
Slide 16 - Quizvraag
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 17 - Tekstslide
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 18 - Tekstslide
Down the tube!
Oesophagus
Peristalsis: moving food down your oesaphagus (gullet)
Slide 19 - Tekstslide
Why is your stomach rumbling?
-peristalsis, muscle activity
- mechanical digestion
-Empty stomach and intestines make a louder sound!
Slide 20 - Tekstslide
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 21 - Tekstslide
small intestine
Slide 22 - Tekstslide
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 23 - Tekstslide
In your small intestine
Intestinal juice
(carbohydrases, proteases, lipases) Complete digestion of food, made by the wall of the small intestine
Slide 24 - Tekstslide
Slide 25 - Video
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 26 - Sleepvraag
Amylase is an example of a
A
Carbohydrase
B
Lipase
C
Protease
Slide 27 - Quizvraag
During the break down of proteins you get:
A
glucose
B
amino acids
C
fatty acids
Slide 28 - Quizvraag
The environment of the stomach is
A
Acidic
B
Alkaline
Slide 29 - Quizvraag
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 30 - Tekstslide
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