2.2 - the digestive system

The digestive system

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The digestive system

Slide 1 - Diapositive

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 - Diapositive

HW Review

Slide 3 - Diapositive

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 - Diapositive

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 - Diapositive

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 - Diapositive

Chemical Digestion

Breaking food into even smaller molecules
How?
Use digestive juices made in the digestive glands
Digestive juices contain enzymes.

Slide 7 - Diapositive

Slide 8 - Vidéo

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 - Diapositive

Peristalsis

Slide 10 - Diapositive

Read 2.2 - The digestion system

V: Qs 1 t/m 3, 5 , 6 and 8

Slide 11 - Diapositive