review lesson digestion

Review lesson 
Chapter 4:Food and digestion
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This lesson contains 33 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 30 min

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Review lesson 
Chapter 4:Food and digestion

Slide 1 - Slide

The 7 nutrients we need
  1. Proteins
  2. Carbohydrates
  3. Fats
  4. Water
  5. Vitamins
  6. Minerals
  7. Fibres

Slide 2 - Slide

What do we need nutrients for? 
  1. Growth and repair
  2. Energy
  3. To stay healthy 

Slide 3 - Slide

GROWTH & REPAIR
ENERGY
STAYING HEALTHY
PROTEINS
CARBOHYDRATES
FATS
MINERALS
WATER
FIBRE
VITAMINS

Slide 4 - Drag question

Balanced Diet
  • All nutrients
  • Balanced amounts

RDA = Recommanded daily amount
-body size
-how active
-growing 

Slide 5 - Slide

Unbalanced diet
  • Obesity
  • Anorexia
  • Boulemia 

Slide 6 - Slide

Slide 7 - Slide

Dietary choices
  • Vegetarian
  • Vegan
  • Halal
  • Kosher 

Slide 8 - Slide

Pos = Black/Blue
Iodine test for starch 

Slide 9 - Slide

Pos = Orange
Benedict's test for glucose

Slide 10 - Slide

- 2 FINGERS OF EACH NUTRIENT
- 5 TEST TUBES
BLUE - 5 DROPS
CLEAR - 3 DROP
MIGHT NEED SHAKING
TEST 3
Pos = purple color

Slide 11 - Slide

PHASES OF DIGESTION:
  • INGESTION
  • MECHANICAL DIGESTION
  • CHEMICAL DIGESTION
  • ABSORPTION
  • EGESTION
  • DEFAECATION

Slide 12 - Slide

INGESTION:
MOVING THE FOOD INTO YOUR MOUTH

Slide 13 - Slide

MECHANICAL DIGESTION:
  • BREAKING THE FOOD INTO SMALLER PIECES.
  • THIS IS DONE BY YOUR TEETH

Slide 14 - Slide

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

Slide 15 - Slide

KERBOODLE PAGE 54

Slide 16 - Slide

Chemical digestion Step 1
the place: the mouth (oesophagus)
the enzyme: amylase
the liquid: saliva (produced by the salivary glands)
the nutrient: carbohydrates
the products: glucose & maltose

The enzymes in your saliva start breaking down the carbohydrate molecules into maltose and glucose.

Slide 17 - Slide

Down the tube!
Oesophagus
Peristalsis: moving food down your gut

Slide 18 - Slide

In your stomach
Digestive juices

-Proteases -> digestion proteins -> amino acids
-Hydrochloric acid -> acid PH, best for the enzymes
-Rennin (only babies) makes milk solid, stays in the stomach longer

-Acidic environment also kills germs

Slide 19 - Slide

In your small intestine
3 important liquids: 
-Pancreatic juice (carbohydrases, proteases and lipases)
-Bile from the liver, stored in the gall bladder
     -Bile is alkaline neutralises acid from the stomach, best Ph for the small intestine                 enzymes to work
      -Bile emulsifies fats, increases surface area of fats lipase enzymes to act upon
Intestinal juice (carbohydrases, proteases, lipases) Complete digestion of food, made by                            the wall of the small intestine

Slide 20 - Slide

Stomach
Mouth
Small intestine
Rennin
Lipase
Protease
Amylase
Protease
Amylase

Slide 21 - Drag question

Absorption
-Small intestine
-food had to pass through the wall into the blood


contains millions of tiny, finger like processes called : Villi 

Slide 22 - Slide

Slide 23 - Slide

CHARACTERISTICS OF THE VILLUS:

- LARGE SURFACE AREA (MORE CONTACT MORE ABSORPTION)
- ONE CELL LAYER THICK (THIN WALLS FASTER ABSORPTION)
- GOOD BLOOD SUPPLY (FAST TRANSPORT OF NUTRIENTS TO THE REST OF THE BODY)

Slide 24 - Slide

Large intestine
-Mainly fibre, dead cells, bacteria and water
-Water absorbed in the blood 
-Solid waste (feaces) stored in the rectum



Egestion--> passing out of indigestible food 

Slide 25 - Slide

Extra : The appendix
Functions - not really known
-Removal does not cause health problens

Slide 26 - Slide

Esophagus
Liver
Large intestine
Gall bladder
Stomach
Pancreas
Small intestine
anus

Slide 27 - Drag question

Ingestion
Mechanical digestion
Chemical digestion
Absorption
Egestion
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. 
the movement of nutrients from the digestive system to the blood
The passing out of indigestible food through the anus, in the form of faeces.

Slide 28 - Drag question

Which nutrient provides energy?
A
carbohydrates
B
water
C
minerals
D
vitamins

Slide 29 - Quiz

Which nutrient provides use with building blocks for growth & repair?
A
carbohydrates
B
water
C
minerals
D
vitamins

Slide 30 - Quiz

What are potatoes a good source of?
A
carbohydrates
B
water
C
fibres
D
proteins

Slide 31 - Quiz

What are oranges a good source of ?
A
minerals
B
water
C
fibres
D
vitamins

Slide 32 - Quiz

What are eggs a good source of?
A
carbohydrates
B
water
C
fibres
D
proteins

Slide 33 - Quiz