digestive system-1

The digestive system
kerboodle pages 54-58
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The digestive system
kerboodle pages 54-58

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

MECHANICAL DIGESTION:

  • BREAKING THE FOOD INTO SMALLER PIECES.
  • THIS IS DONE BY YOUR TEETH
  • BITING AND CHEWING

Slide 5 - Diapositive

Slide 6 - Diapositive

Why chew?
Digestive juices need to digest nutrients




Chewing makes the surface area bigger

Slide 7 - Diapositive

CHEMICAL DIGESTION:
  • BREAKING THE FOOD INTO EVEN SMALLER MOLECULES.
  • USING ENZYMES TO BREAK DOWN THE FOOD MOLECULES. 

Slide 8 - Diapositive

enzymes 
substrate is broken down

Slide 9 - Diapositive

Slide 10 - Diapositive

Slide 11 - Diapositive

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 - Quiz

Which limiting factor is directly connected to the enzymes?
A
sunlight
B
temperature
C
water
D
carbon dioxide

Slide 13 - Quiz

Breaking of large molecules into smaller molecules is called
A
chemical digestion
B
mechanical digestion

Slide 14 - Quiz

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 - Quiz

The digestion of starch starts in the ...
A
Mouth
B
Stomach
C
Duodenum
D
Small intestine

Slide 16 - Quiz

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 - 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 18 - Diapositive

Down the tube!
Oesophagus
Peristalsis: moving food down your oesaphagus (gullet)

Slide 19 - Diapositive

Why is your stomach rumbling? 
-peristalsis, muscle activity
- mechanical digestion

-Empty stomach and intestines make a louder sound!

Slide 20 - 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 21 - Diapositive

small           intestine

Slide 22 - 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 23 - Diapositive

In your small intestine

Intestinal juice (carbohydrases, proteases, lipases) Complete digestion of food, made by the wall of the small intestine

Slide 24 - Diapositive

Slide 25 - 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 26 - Question de remorquage

Amylase is an example of a
A
Carbohydrase
B
Lipase
C
Protease

Slide 27 - Quiz

During the break down of proteins you get:
A
glucose
B
amino acids
C
fatty acids

Slide 28 - Quiz

The environment of the stomach is
A
Acidic
B
Alkaline

Slide 29 - 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 30 - Diapositive