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2.2 - the digestive system
Welcome everyone
Think about...
Take off your coat, hat/cap off.
Mobile in the phone bag (on silent).
Book (laptop) + notebook, pen on the table. Bag on the floor.
Sit in your own place.
You can eat and drink in the canteen.
5 minutes.
timer
5:00
1 / 26
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Biologie
Middelbare school
vwo
Leerjaar 2
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Items in this lesson
Welcome everyone
Think about...
Take off your coat, hat/cap off.
Mobile in the phone bag (on silent).
Book (laptop) + notebook, pen on the table. Bag on the floor.
Sit in your own place.
You can eat and drink in the canteen.
5 minutes.
timer
5:00
Slide 1 - Slide
Schedule
Repetition 5 min.
Explanation 2.2/2.3 10min.
Doing a Assignments 10 min
Explanation 2.2/2.3 10min.
Finish Posters
Closing 5 min.
Slide 2 - Slide
HW Review
Slide 3 - Slide
Nutriens
: usable components in food
Dietary fibre
: are indigestible parts of the plants
vegetable produces
Animal products
Foodstuffs
Slide 4 - Slide
Function of Nutrients
Building blocks: grow/develop/repair
Fuels/Energy-rich: by respiration in cells to provide energy
protection: to stay healty
Slide 5 - Slide
6 groups of nutrition's
carbohydrates
fats
proteins
minerals
vitamins
Water
Slide 6 - Slide
Learning goals
At the end of the lesson..
You can describe the functions of digestion, digestive juices and enzymes.
You can describe the function of peristalsis and how it works.
You can list the functions and characteristics of the parts of the digestive system.
Slide 7 - Slide
What is digestion?
Fig. 1: digestive system
Contains the
intestinal tract
:
long piece of tubing from mouth
to anus
Slide 8 - Slide
The digestive system
Slide 9 - Slide
Digestion continued
Nutrients from food absorbed into bloodstream
What can be absorbed into the blood? - Glucose, minerals, water vitamins
What should be digested first? - Proteins, carbohydrates and fats
Slide 10 - 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 11 - Slide
Enzymes
Slide 12 - Slide
the oral cavity, pharynx and oesophagus
what are the names of the glands together? what do they do?
salvary glands produces salvia: containing water, enzymes and mucus
Slide 13 - Slide
Chemical Digestion
Breaking food into even smaller molecules
How?
Use
digestive juices
made in the digestive glands
Digestive juices contain
enzymes.
Slide 14 - Slide
Slide 15 - Video
Make assignments
Make assignment 1,2,3 and 5 of 2.2
timer
10:00
Slide 16 - Slide
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 17 - Slide
Peristalsis
Slide 18 - Slide
Peritalsis & peristaltic movement
Slide 19 - Slide
Slide 20 - Slide
stomach
circular + longitudinal muscle for constantly movement
pyloric sphincter is a circular muscle who close off the stomach
the gastric gland produces gastric juices: containing: water, enzymes to digest proteins and hydrochloric acid to kill germs
Slide 21 - Slide
liver produces bile (gal)
bile is temporarily stored in the gall bladder
bile passes through the bile duct when necessary
bile emulsifies fats to make it easier for enzymes to digest.
Slide 22 - Slide
Slide 23 - Slide
The wall of the intestines contains intestinal glands. They produce intestinal juice.
various enzymes digest carbohydrates, fats and proteins
the wall is convoluted, the intestinal folds in turn have protrusions called intestinal villi.
the wall of the intestinal villi is very thin. nutrients can pass easily
Slide 24 - Slide
direct after the small intestines the caecum. (blinde darm).
the protrusion is called the appendix.
inflamed in appendicitis; the appendix will be surgically removed.
In the large intestine water is extracted from the pulp.
If not -> Diarrhea
Only undigested residues left over
Bacteria are able to digest some cellulose and turn is into glucose
glucose is absorbed into the bloodstream.
Slide 25 - Slide
HW
Read 2.2 - The digestion system
Qs 1 t/m 3, 5 , 6,7 and 8
Done?
finish 2.1: 1 until 9 or start with 2.3
timer
15:00
Slide 26 - Slide
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