YR2-K4-LSN8

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

HAVE READY:

- JOIN THIS LESSONUP

- KERBOODLE PAGE 54

- YOUR NOTEBOOK

- GOOGLE CLASSROOM

LESSON 8

TODAY'S LEARNING GOALS:

• I have a good knowledge and understanding of the enzymes and their workings.
• I know how our body absorbs nutrients and where the various nutrients get absorbed.

TODAY'S KEY WORDS:

• Amylase 
• Protease 
• Lipase 
• Fatty acids
• Glycerol 
• Saliva 
• Mucus
• Renin
• Bile

read kerboodle pages 54-58

Remember: what are the 6 phases of digestion?

1. Ingestion
2. Mechanical digestion
3. Chemical digestion
4. Absorption
5. Egestion
6. Defaecation

CHEMICAL DIGESTION:

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

Chemical digestion step 1: 

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

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

Chemical digestion 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 digestion step 3: 

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

• Bile is an alkaline 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 digestion step 3: part B

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

Chemical digestion step 3: part C

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

KERBOODLE PAGE 54

ABSORPTION

• NUTRIENTS AND SALTS ARE ABSORBED IN THE SMALL INTESTINE
• WATER IS ABSORBED IN THE LARGE INTESTINE

EGESTION & DEFAECATION

• MOVING UNABSORBED MATERIALS FROM THE LARGE INTESTINE TO THE RECTUM
• REMOVING POOP FROM YOUR BODY
• HAPPENS ON AVERAGE ONCE EVERY 24 HOURS.

Announcement: Your next lesson with me as your teacher will be on May 13 :)

• For the next couple of weeks, you will have class with Mrs. Cooper again.
• Because I will be teaching at a different school for 5 weeks

In the meantime, I wish you good luck with your test & assignments, and I am looking forward to seeing your again in May!

IMPORTANT DEADLINES

• LESSON 8: SUMMARY (OPTIONAL)
• LESSON 9: GLOSSARY QUIZ (OPTIONAL)
• LESSON 10: TEST & DEADLINE PROJECT 

HW FOR LESSON 9

• Complete the in class assignments for lesson 7 and 8
• Prepare for the review lesson (read all notes and exercises, be prepared to ask the teacher questions and be prepared for a practice test of some kind)
• Make sure you write down your summaries of the day
• Make a plan and decide if you are doing the glossary quiz for a grade
• Work on your project

Assignments during lesson 7

Assignments during lesson 8