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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.
timer
5:00
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Biologie
Middelbare school
vwo
Leerjaar 2
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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 - Diapositive
Today's lesson
1. review: nutrients 3
2. video + theory: digestion 25
3. assignments 10
4. lesson end 2
homework: +/- 30 min.
Slide 2 - Diapositive
HW Review
Slide 3 - Diapositive
List the 6 groups of nutrients
(try to do this without looking in your (note)book)
Slide 4 - Question ouverte
theory
- what is digestion?
- chewing
- peristaltis
Slide 5 - Diapositive
Digestive system
Fig. 1 pg. 97:
digestive system
Contains the
intestinal tract
:
long piece of tubing from mouth
to anus
Slide 6 - Diapositive
Slide 7 - Vidéo
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 - Diapositive
Digestion
Digestion:
Breakdown
of nutrients from food into small molecules that can be
absorbed
(opgenomen) from the intestines into the blood.
Slide 9 - Diapositive
Big vs. Small
Big molecules
-> can not get through the gut wall
Small molecules
-> can get through the gut wall
Slide 10 - Diapositive
Slide 11 - Diapositive
Fases of digestion. Put them in the right order.
1
2
3
4
digestion
ingestion
absorption
egestion
Slide 12 - Question de remorquage
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 - Diapositive
DIGESTION:
Digestion can occur
mechanically
(through movement) or
chemically
(by enzymes!).
Slide 14 - Diapositive
Chewing!
Increases the
surface area
of food.
--> helps chemical digestion to go faster.
mechanical digestion
Slide 15 - Diapositive
Chemical Digestion
Breaking food into even smaller molecules
Using
digestive juices
made in the digestive glands
Digestive juices contain
enzymes.
Slide 16 - Diapositive
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 - Question de remorquage
Peristalsis
Alternate contraction and relaxation of circular + longitudinal muscles through the digestive tract
Slide 18 - Diapositive
Slide 19 - Diapositive
Peritalsis & peristaltic movement
Slide 20 - Diapositive
(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 - Diapositive
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