2.2 - the digestive system

The digestive system

1 / 11

Slide 1: Tekstslide

BiologieMiddelbare schoolvwoLeerjaar 2

In deze les zitten 11 slides, met tekstslides en 1 video.

Onderdelen in deze les

The digestive system

Slide 1 - Tekstslide

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 - Tekstslide

HW Review

Slide 3 - Tekstslide

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 - Tekstslide

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 - Tekstslide

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 - Tekstslide

Chemical Digestion

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

Slide 7 - Tekstslide

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 - Tekstslide

Peristalsis

Slide 10 - Tekstslide

Read 2.2 - The digestion system

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

Slide 11 - Tekstslide