2.2 - the digestive system

start task 'digestive system'
1. copy these learning objectives to your zuidschrift:
- You can describe the functions of digestion, digestive juices and enzymes.
- You can describe the function of peristalsis and how it works.

2. join this LessonUp.

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Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 2

This lesson contains 21 slides, with interactive quizzes, text slides and 1 video.

Items in this lesson

start task 'digestive system'
1. copy these learning objectives to your zuidschrift:
- You can describe the functions of digestion, digestive juices and enzymes.
- You can describe the function of peristalsis and how it works.

2. join this LessonUp.

timer
5:00

Slide 1 - Slide

Today's lesson
1. review: nutrients                            3
2. video + theory: digestion          25
3. assignments                                   10 
4. lesson end                                         2

homework: +/- 30 min.

Slide 2 - Slide

HW Review

Slide 3 - Slide

List the 6 groups of nutrients
(try to do this without looking in your (note)book)

Slide 4 - Open question

theory
- what is digestion?
- chewing
- peristaltis

Slide 5 - Slide

Digestive system
Fig. 1 pg. 97: digestive system 
Contains the intestinal tract
long piece of tubing from mouth 
to anus


Slide 6 - Slide

Slide 7 - Video

food --> cells
  • The food we eat contains important nutrients that our body needs.
  • To get these nutrients to our cells, they must first enter our blood.
  • Some nutrients like glucose, minerals, and vitamins are already small enough to be absorbed from the intestines into the blood.
  • Other nutrients need to be broken down by digestion before they can be absorbed.
what for?
fuel
building material
reserves
protection

Slide 8 - Slide

Digestion
Digestion: Breakdown of nutrients from food into small molecules that can be absorbed (opgenomen) from the intestines into the blood.

Slide 9 - Slide

Big vs. Small
Big molecules ->  can not get through the gut wall

Small molecules ->  can get through the gut wall

Slide 10 - Slide

Slide 11 - Slide

Fases of digestion. Put them in the right order.
1
2
3
4
digestion
ingestion
absorption
egestion

Slide 12 - Drag question

Egestion
The process of removing undigested food from the body.

Parts of the food that can't be used by the body are expelled as waste (on the toilet!)

Slide 13 - Slide

DIGESTION:

Digestion can occur mechanically (through movement) or chemically (by enzymes!).

Slide 14 - Slide

Chewing!

Increases the surface area of food. 

--> helps chemical digestion to go faster.
mechanical digestion

Slide 15 - Slide

Chemical Digestion
  • Breaking food into even smaller molecules
  • Using digestive juices made in the digestive glands
  • Digestive juices contain enzymes.

Slide 16 - Slide

chemical digestion
mechanical digestion
enzymes
chewing
to help swallow food more easily
surface area enlargement
digestive juices 
in the mouth
e.g. in stomach,  intestines
in the mouth

Slide 17 - Drag question

Peristalsis
Alternate contraction and relaxation of  circular + longitudinal muscles through the digestive tract

Slide 18 - Slide

Slide 19 - Slide

Peritalsis & peristaltic movement

Slide 20 - Slide

(homework) assignments
1. translate organ names (fig 1 pg 97) 
    into Dutch
2. do asg. 1 t/m 3, 5 , 6 and 8 (pg. 100-103)

use text pg. 97-100
timer
1:00

Slide 21 - Slide