digestive system-2

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Digestion 

have ready: your homework questions

Topic of today: absorption and egestion

match up activity

You will get cards with names/ functions/ pictures of a part of the digestive system.

• Match up the cards
• Lay them out in the order of which it is found in the digestive system.

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. 

Amylase is an example of

1. Carbohydrase
2. Lipase
3. Protease

During the break down of proteins you get:

1. glucose
2. amino acids
3. fatty acids

Small intestines

Place where everything is digested into the smallest building blocks

• carbohydrates into glucose molecules
• proteins into amino acids
• fats into glycerol and fatty acids

The circulatory system

is responsible for getting the nutrients from the small intestines to the rest of the body.

• But first the molecules have to get from the small intestines to the blood
• this is called absorption

small intestine 

• is very long-> 6 meters
• has many fingerlike projections-> Villi
• Large total surface area -> making  absorption go faster

Characteristics of villi

• One cell layer thick (thin walls for faster absorption)
• Good blood supply (fast transport of nutrients to the rest of the body)

Appendix

It has no function but can become infected and has to be removed.

Large intestine

• Mainly fibre, dead cells, bacteria and water
• Water absorbed in the blood 
• waste product becomes more solid-> faeces

bacteria

many bacteria live inside the digestive tract

• they help with digestion
• produce vitamins (K)

Much research is being done. 

'Poepbank'

Where does faeces collect?

• in the RECTUM
• when enough is collected the brain signals for elimination
• this is called EGESTION

homework

Do questions digestion #2  1-10

Study for the Glossary Quiz