Take out your coat and wait quietly for the Assignment in the next dia.
1 / 28
suivant
Slide 1: Diapositive
BiologieMiddelbare schoolhavo, vwoLeerjaar 2
Cette leçon contient 28 diapositives, avec quiz interactifs, diapositives de texte et 1 vidéo.
La durée de la leçon est: 30 min
Éléments de cette leçon
Welcome- 2EH
Please take your seat
Get you notebook , book and pen.
Take out your coat and wait quietly for the Assignment in the next dia.
Slide 1 - Diapositive
Start activity - 10 min (ZS)
Get your book.
Complete ex. 10 p.103
Done?
Begin reading basic 2.2 : the digestive system
timer
10:00
Slide 2 - Diapositive
Goals
Can describe the functions of digestion, digestive juices and enzymes.
Can list the parts of your dentition and their functions.
Can describe the function of peristalsis and how it works.
Slide 3 - Diapositive
The digestive system
During digestion, larger nutrient molecules are broken into smaller digestion products in two ways:
1. Breakdown by chewing
2. Converting the nutrients using digestive juices
Slide 4 - Diapositive
Your teeth
The food you eat needs to go through your whole intestinal tract (about 15 meters!).
So the food needs to get smooth, whole and wet.
All that happens in your mouth.
You chew it and your salivary glands add saliva.
Slide 5 - Diapositive
Teeth
INCISORS
CANINES
PREMOLARS
MOLARS
CHILD HAS 20
ADULT HAS 32
Slide 6 - Diapositive
Your teeth
Besides that, by chewing your food you create more surface. This means more space for digestive juices to attach to and digest food more easily. This is a way of mechanical digestion.
Slide 7 - Diapositive
CHEMICAL DIGESTION:
BREAKING THE FOOD INTO EVEN SMALLER MOLECULES.
USING ENZYMES TO BREAK DOWN THE FOOD MOLECULES.
Slide 8 - Diapositive
ENZYMES
Salivary glands: amylase
Stomach wall: protease (pepsin)
Pancreas: protease, amylase, lipase
Small intestines: peptidase, maltase, nuclease
Slide 9 - Diapositive
read 2.2
Complete e. 1 -4 , p.100-101
Slide 10 - Diapositive
Enzymes
Slide 11 - Diapositive
Chemical digestion
Enzymes: Important chemicals
Slide 12 - Diapositive
Chemical digestion Step 1
starts in: the mouth
the enzyme: amylase (a carbohydrase)
the liquid: saliva
the nutrient: carbohydrates
the products: glucose
The enzymes in your saliva start breaking down the carbohydrate molecules into glucose.
Slide 13 - Diapositive
Down the tube!
Oesophagus
Peristalsis: moving food down your oesaphagus (gullet)
Slide 14 - Diapositive
Why is your stomach rumbling?
-peristalsis, muscle activity
- mechanical digestion
-Empty stomach and intestines make a louder sound!
Slide 15 - Diapositive
In your stomach
Digestive juices are added
Proteases-> digestion proteins -> amino acids
Hydrochloric acid -> acid PH, best for the enzymes + acidic environment also kills germs
Rennin (only babies) makes milk solid, stays in the stomach longer
Slide 16 - Diapositive
small intestine
Slide 17 - Diapositive
In your small intestine
2 important liquids added in the first part (the duodenum)
Pancreatic juice(carbohydrase, proteases and lipases)
Bile from the liver, stored in the gall bladder
Bile is alkaline neutralizes acid from the stomach
Bile emulsifies fats, increases surface area of fats lipase enzymes to act upon
Slide 18 - Diapositive
In your small intestine
Intestinal juice (carbohydrases, proteases, lipases) Complete digestion of food, made by the wall of the small intestine
Slide 19 - Diapositive
Slide 20 - Vidéo
To do:
Read 2.2 - The digestive system
Complete ex. 1 - 3 & 5-9
Done?
Login to the class lesson up folder and complete the lesson
Practice the flash cards
Slide 21 - Diapositive
1
2
3
4
5
6
7
8
heart
large intestine
small intestine
stomach
lung
liver
brain
kidney
Slide 22 - Question de remorquage
During the break down of proteins you get:
A
glucose
B
amino acids
C
fatty acids
Slide 23 - Quiz
The environment of the stomach is
A
Acidic
B
Alkaline
Slide 24 - Quiz
Amylase is an example of a
A
Carbohydrase
B
Lipase
C
Protease
Slide 25 - Quiz
Which enzyme breaks down carbohydrates in the mouth?
A
Maltase
B
Amylase
C
Protease
D
Lipase
Slide 26 - Quiz
What enzyme aids in the breakdown of proteins in the stomach?
A
Lactase
B
Amylase
C
Pepsin
D
Sucrase
Slide 27 - Quiz
Which enzyme assists in the digestion of fats in the small intestine?