This lesson contains 36 slides, with interactive quizzes, text slides and 1 video.
Lesson duration is: 30 min
Items in this lesson
Digestion
Bricks 3.3 + 3.4
Slide 1 - Slide
Digestion
Digestion: Breakdown of food molecules into small food molecules
When food is digested it is absorbed
Slide 2 - Slide
Big vs. Small
Big molecules -> Insoluble can not get through the gut wall (go out)
Small molecules -> Soluble can get through the gut wall
Slide 3 - Slide
Fases of digestion. Put them in the right order.
1
2
3
4
digestion
ingestion
absorption
elimination
Slide 4 - Drag question
FASES OF DIGESTION:
INGESTION
CHEMICAL AND MECHANICAL DIGESTION
ABSORPTION
ELIMINATION
Slide 5 - Slide
Slide 6 - Slide
Slide 7 - Slide
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 8 - Drag question
CHEMICAL DIGESTION:
BREAKING THE FOOD INTO EVEN SMALLER MOLECULES.
USING ENZYMES TO BREAK DOWN THE FOOD MOLECULES.
Slide 9 - Slide
3.4 organising digestion
- the organs and their function in the digestive system
- peristalsis, digestion, emulsification
- digestive juices and their function
Slide 10 - Slide
Chemical digestion
Enzymes: Important chemicals
Slide 11 - Slide
Slide 12 - Slide
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 13 - Slide
Down the tube!
Oesophagus
Peristalsis: moving food down your oesaphagus (gullet)
Slide 14 - Slide
Why is your stomach rumbling?
-peristalsis, muscle activity
- mechanical digestion
-Empty stomach and intestines make a louder sound!
Slide 15 - Slide
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 16 - Slide
duodenum
salivary gland
liver
pancreas
gall bladder
small intestine
large intestine
stomach
oesophagus
rectum
appendix
pancreatic duct
anus
Slide 17 - Drag question
Amylase is an example of a
A
Carbohydrase
B
Lipase
C
Protease
Slide 18 - Quiz
After breaking down of proteins you get:
A
glucose
B
amino acids
C
fatty acids
D
glycerol
Slide 19 - Quiz
The environment of the stomach is
A
Acidic
B
Alkaline
C
Neutral
Slide 20 - Quiz
After breaking down fats you get:
Slide 21 - Open question
3.4
practice makes perfect
Slide 22 - Slide
3.4 organising digestion part 2
- the organs and their function in the digestive system
- peristalsis, digestion, emulsification
- digestive juices and their function
Slide 23 - Slide
Slide 24 - Slide
inactive enzyme pepsinogen
active enzyme pepsin
Slide 25 - Slide
Step 3: duodenum
Slide 26 - Slide
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 27 - Slide
Slide 28 - Slide
Bile is made by the:
A
liver
B
gall bladder
C
pancreas
D
duodenum
Slide 29 - Quiz
The food molecules in the duodenum are broken down by enzymes in
A
bile
B
pancreatic juice
C
pancreatic juice and bile
Slide 30 - Quiz
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 31 - Quiz
Step 4: small intestine
Intestinal juice (carbohydrases, proteases, lipases) Complete digestion of food, made by the wall of the small intestine