2t Bricks digestion 3.3 + 3.4

Digestion
Bricks 3.3 + 3.4
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Slide 1: Tekstslide
BiologieMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 26 slides, met interactieve quizzen, tekstslides en 1 video.

time-iconLesduur is: 30 min

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Digestion
Bricks 3.3 + 3.4

Slide 1 - Tekstslide

Digestion
Digestion: Breakdown of food molecules into small food molecules 

When food is digested it is absorbed  

Slide 2 - Tekstslide

Big vs. Small
Big molecules -> Insoluble can not get through the gut wall

Small molecules -> Soluble can get through the gut wall

Slide 3 - Tekstslide

Fases of digestion. Put them in the right order.
1
2
3
4
digestion
ingestion
absorption
elimination

Slide 4 - Sleepvraag

FASES OF DIGESTION:
  • INGESTION
  • CHEMICAL AND MECHANICAL DIGESTION
  • ABSORPTION
  • ELIMINATION

Slide 5 - Tekstslide

Which fase of digestion is this?

Slide 6 - Open vraag

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 7 - Sleepvraag

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

Slide 8 - Tekstslide

Chemical digestion
Enzymes: Important chemicals

Slide 9 - Tekstslide

duodenum
salivary gland
liver
pancreas
gall bladder
small intestine
large intestine
stomach
oesophagus
rectum
appendix
pancreatic duct
anus

Slide 10 - Sleepvraag

Chemical digestion Step 1: mouth
  • 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 11 - Tekstslide

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

Slide 12 - Tekstslide

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

-Empty stomach and intestines make a louder sound!

Slide 13 - Tekstslide

Step 2: 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 14 - Tekstslide

Step 3: duodenum

Slide 15 - Tekstslide

Step 3: duodenum
2 important liquids added in the first part (the duodenum)
  • Pancreatic juice (contains enzymes: carbohydrases, proteases and lipases)
  • Bile made by the liver, stored in the gall bladder
    --> Bile is alkaline neutralises acid from the stomach
    --> Bile emulsifies fats, increases surface area of fats, makes it easier for lipase enzymes to act upon

Slide 16 - Tekstslide

Slide 17 - Tekstslide

Bile is made by the:
A
liver
B
gall bladder
C
pancreas
D
duodenum

Slide 18 - Quizvraag

The food molecules in the duodenum are broken down by enzymes in
A
bile
B
pancreatic juice
C
pancreatic juice and bile

Slide 19 - Quizvraag

Is pancreatic juice a digestive juice? And what about bile?
A
Both are digestive juices
B
Only pancreatic juice is a digestive juice
C
Only bile is a digestive juice

Slide 20 - Quizvraag

Step 4: small intestine

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

Slide 21 - Tekstslide

Slide 22 - Video

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

Slide 23 - Quizvraag

After breaking down of proteins you get:
A
glucose
B
amino acids
C
fatty acids
D
glycerol

Slide 24 - Quizvraag

After breaking down fats you get:

Slide 25 - Open vraag

The environment of the stomach is
A
Acidic
B
Alkaline
C
Neutral

Slide 26 - Quizvraag