L7: Chemical digestion

• Biologie
• Middelbare school
• havo
• Leerjaar 1

Get ready

-Macbook on classroom for the glossary quiz

Get ready

-Summary cartoon

-LessonUp

Feedback & Test 

Food diary or Lab report 

Deadline final report: 20 December

Test

TV2D - 14 December 

TV2F TV2E - 13 December

Overview digestion

Digestion: Breakdown of food molecules into small food molecules 

When food is absorbed it is digested

Big vs. Small

Big molecules -> Insoluble can not get trough the gut wall

Small molecules -> Soluble can get trough the gut wall

Chemical digestion

Enzymes: Important chemicals

Chemical digestion Step 1

the place: the mouth (esophagus)

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.

Down the tube!

Esophagus

Peristalsis: moving food down your gut

Why is your stomach rumbling? 

-peristalsis, muscle activity

-Empty stomach and intestines make a louder sound!

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

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

Amylase is an example of a

1. Carbohydrase
2. Lipase
3. Protease

During the break down of proteins you get:

1. glucose
2. amino acids
3. fatty acids

The environment of the stomach is

1. Acidic
2. Alkaline

HW for next time

-Complete your summary cartoon 

-WB page 27

-DO excersize 1t/m4 on page 60 of Kerboodle

-update your mindmap