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2.2 - the digestive system
The digestive system
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Biologie
Middelbare school
vwo
Leerjaar 2
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The digestive system
Slide 1 - Slide
Today's lesson
1. Review HW/ Do Test Yourself 2.1
2. What is digestion?
3. Discuss chewing
4. What are digestive juices?
5. Explain peristalsis
Slide 2 - Slide
HW Review
Slide 3 - Slide
What is digestion?
Fig. 1: digestive system
Contains the intestinal tract:
long piece of tubing from mouth
to anus
To do: translate organ names into
Dutch
Slide 4 - Slide
Digestion continued
Function of digestive system?
Nutrients from food absorbed into bloodstream
What can be absorbed into the blood?
Glucose, minerals, water vitamins
What is missing?
Proteins, carbohydrates and fats
NEED TO BE DIGESTED FIRST
Slide 5 - Slide
How is food digested?
Digested: break down into small pieces
2 types of digestion: Mechanical and Chemical digestion
Mechanical: chewing
Function: break the food into little pieces so that the surface area is larger.
Slide 6 - Slide
Chemical Digestion
Breaking food into even smaller molecules
How?
Use
digestive juices
made in the digestive glands
Digestive juices contain
enzymes.
Slide 7 - Slide
Slide 8 - Video
Peristalsis
Food moves through lots of tubes : intestinal tract
Oesophagus
Duodenum
Small and large intestines
peristalsis = muscle movements that push food through the intestinal tract
Slide 9 - Slide
Peristalsis
Slide 10 - Slide
HW
Read 2.2 - The digestion system
V: Qs 1 t/m 3, 5 , 6 and 8
Slide 11 - Slide
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