B4 U1 2HV

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

B4 Breathing

• Take off your jacket
• Put your things on your desk

       Book, notebook, pencil case

• Bag on the floor
  
• Read pages 27-

Lessongoals

• You can state the differences between inhaled and exhaled air.
• You can describe how inhalation and exhalation are achieved

Dinand owns a bottle containing nitrogen (N2). He let's some of this gas (nitrogen) go into a beaker with clear limewater. What will happen?

1. Limewater stays clear
2. Limewater becomes cloudy quickly
3. Limewater becomes cloudy slowly
4. Limewater?

Samir also owns a bottle, this one contains an unknown gas. He also let's some of this gas go into limewater. The limewater becomes cloudy.
The gas must be ..

1. Oxygen (O2)
2. Carbon dioxide (CO2)
3. Nitrogen (N2)
4. Helium (H2)

What part in the pharynx (throat) prevents food from getting in your nasal cavity

1. tongue
2. epiglottis
3. uvula
4. oesophagus

Your body contains alveoli. How many do you think there are?

The windpipe is always open. Rings made out of ... keep it open.
Fill in the word on the dots

Breathing through your nose is healthier than through your mouth because ...

Oxygen is taken out of the inhaled air, it goes into the blood

O2

The alveolus

Carbon dioxide goes from your blood into the air inside the alveolus

CO

the walls of the alveolus are only 1 layer of cells thick. This makes exchanging of gas very easy.

The lungs contains thousands of alveoli, many more than are shown on the image.

06:40-06:48

06:54-06:57

Alveoli

Chest breathing

Abdominal breathing

• Most people
• Ribs move up and down
• This movement 'sucks' air into the  lungs

• Often learned behaviour
• Diaphragm moves up and down
• This movement 'sucks' air into the lungs

Many people use a mix of these types of breathing

00:16

What gas is your breathing mainly for?

00:17-00:22

Chest breathing

00:26-00:31

Abdominal breathing

01:26

Finally the air you inhale enters the ..

02:12

Why does your body need oxygen?
for ...

What you should do:

• Read pages  27-29
• Do asgmt  1-8, 4c, 9c, 10c pgs. 30-33 

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do:

• Read pages 27-29
• Do asgmt 1-8, 4c, 9c, 10c pgs. 30-33 

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Tidy Duty

Today these people are on tidy duty

• Desks: empty and straight
• Chairs:  underneath the desks
• Floor: no rubbish