8.2 You breathe

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BiologieMiddelbare schoolvwoLeerjaar 3

This lesson contains 14 slides, with interactive quizzes and text slides.

Items in this lesson

Slide 1 - Slide

- Quiz (knowledge test)
- Learning objectives
- Instruction respiration, cells
- Homework assignments
- End of class

Slide 2 - Slide

8.2 You breathe
You will learn how you breathe and how oxygen ends up in your bloodstream.

You will learn why breathing through your nose is better, and how your breathing is regulated.

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Consumed during respiration
Created during respiration
Is not consumed nor created during respiration
Glucose (sugar)
Carbon dioxide

Slide 4 - Drag question

Cell nucleus
Cell membrane

Slide 5 - Drag question

The intercostal (tussenribspieren) and diaphragm (middenrifspieren) muscles contract.

The ribs tilt upwards and the diaphragm becomes flat.

The chest cavity and your lungs expand.

Slide 6 - Slide

Intercostal (tussenribspieren) and diaphragm (middenrif) muscles relax.

The ribs lower down; the diaphragm becomes convex (bol).

The chest cavity and your lungs reduce in volume.

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Let's zoom in on the alveoli (end of the bronchioles).

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How does the gas exchange happen so fast? 
1. Many alveoli
2. Alveoli have thin walls
3. Many capillaries around the alveoli
4. Continuous supply of fresh air

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How does the air get cleaned and humidified?
Nose hairs: filter out dust.
Mucus producing cells: make the air moist and catch pathogens and dust.
Cilia: sweep dust and pathhogens up to your pharynx.

Why do you have to breathe through your nose?
Blood vessels: warm up the air.
Nerves: detect unpleasant or dangerous smells

Slide 10 - Slide

Breathing regulation
  1. Carbon dioxide receptors in your blood send impulses to the respiratory centre in your brain. 
  2. Your brain sends impulses to your intercostal muscles and diaphragm muscles. 

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Read: 8.2 Make: 3-6, 9-11, 15-17
In your book. You may whisper if you want to discuss an assignment with your neighbour. 
Try to answer the question together. Raise your hand if you can't figure it out together. 
15 minutes
Check your answers with the solutions in Teams. Make assignments 13 and 14.
You have finished your homework! Well done!

Slide 13 - Slide

End of class
Don't pack your bags yet!

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