LESSON 5

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

Have ready:

• straight rows & backs to me
• only lessonup (check code)
• maximum brightness (F2) and maximum sound (F12)
• Check force quit under the 🍏 logo (top left)

TV2B

TV2A

TH2A

TH2B

TV2B

TV2A

TH2B

TH2A

VWO QUIZ FOR HAVO

HAVE READY:

- GOOGLE CLASSROOM

- YOUR HOMEWORK

- KERBOODLE PAGE 54

- YOUR HW

LESSON 5

HW FOR TODAY:

Worksheets teeth

Worksheet teeth exercise 1:

Worksheet teeth exercise  2:

• a. the teeth are cearly different because the animals have different diets.
• b. the carnivore's teeth are adaped to hunting. They can be used for gripping and ripping and because of this they chew very little.
• c. the herbivore's teeth are adapted to grazing, they no longer have/need canines.They have incisors specialised for cutting graas and many molars for grinding dow difficut to digest plants.

Worksheet teeth and flouride left side:

Worksheet teeth and flouride right side:

• a) 4,5 teeth b) 3,5 teeth
• 2. this shows that the average number of decayed teeth per person goes does when the fluoride concentration in the water supply goes up.
• opinions ??

Worksheet teeth and decay:

1. What is the function of the molars and premolars in our digestion?
2. What is plaque?
   
3. Why do you think large cavities are painful?
   
4. Why do you think dentists tell us not to eat too many sugary foods?
   
5. Explain why: a) most toothpastes contain fluoride? b) most toothpastes are weak alkalis?
6. Find out what a ‘wisdom tooth’ is. Do all adults have wisdom teeth?
   

FASES OF DIGESTION:

• INGESTION
• MECHANICAL DIGESTION
• CHEMICAL DIGESTION
• ABSORPTION
• EGESTION
• DEFAECATION

INGESTION:

MOVING THE FOOD INTO YOUR MOUTH

MECHANICAL DIGESTION:

BREAKING YOUR FOOD INTO SMALLER PIECES USIG YOUR TEETH.

MOUTH

STOMACH

LIVER

OESOPHAGUS

DUODENUM

SMALL INTESTINE

LARGE INTESTINE

PANCREAS

CHEMICAL DIGESTION:

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

KERBOODLE PAGE 54

Chemical digeston step 1: 

• the place: the mouth (esophagus)
• the enzyme: amylase
• the liquid: saliva
• the nutrient: carbodrates
• the products: glucose & maltose

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

Chemical digeston step 2: 

• the place: the stomach
• the enzyme: protease
• the liquid: chyme and hydrochloric acid
• the nutrient: proteins
• the products: amino acids

• The enzymes in your chyme start breaking down the protein molecules into amino acids.

Extra info about the stomach: 

• the place: the stomach
• the enzyme: rennin
• the liquid: chyme
• the nutrient: milk
• the products:turns the proteins in milk solid and lump together so it is easier to digest

Before chemical digeston step 3: 

• the place: liver
• the enzyme: none
• the liquid: bile
• the nutrient: fats

• Bile is an alkalyne and neutralises the acid in the chyme. (drops the pH).
• Bile emulsifies (breaks chemical bonds) fats.

Chemical digeston step 3: part A

• the place: the duodenum
• the enzyme: lipase
• the liquid: chyme and bile
• the nutrient: fats
• the products: fatty acids and glycerol

Chemical digeston step 3: part B

• the place: the duodenum
• the enzyme: amylase
• the liquid: chyme 
• the nutrient:carbohydrates and maltose
• the products: glucose

Chemical digeston step 3: part C

• the place: the duodenum
• the enzyme: protease
• the liquid: chyme 
• the nutrient:proteins
• the products: amino acids

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)

HW FOR LESSON 6: Enzymes & Absorption

• Study for the glossary quiz
• Organise your notes from lesson 5
• Organise the information in your mindmap and upload a screenshot.
• Answer the questions on the worksheet about Renin
• Complete the question on tb pages 60-61.