Lesson Starter
1. Which side of the heart is bigger and
why?
2. What is the heart made of?
3. What are the different types of blood
cells and what are their jobs?
4. What is the meaning of recovery time?
Learning Intention
To learn about the
Respiratory system
What is breathing?
The process by which you take IN oxygen and give
OUT carbon dioxide.
When you breathe in:
• Your diaphragm goes down
• Your ribs expand
• Lungs get bigger
When you breathe out:
• Your diaphragm goes up
• Your ribs move inwards
• Lungs get smaller
What is breathing? (copy)
The process by which you take IN oxygen and give
OUT carbon dioxide.
When you breathe in:
• Your diaphragm goes down
• Your ribs expand
• Lungs get bigger
When you breathe out:
• Your diaphragm goes up
• Your ribs move inwards
• Lungs get smaller
Lungs
• Blood- picks up oxygen,
drops off carbon dioxide
• Gas Exchange
• Large surface area
Alveoli
• Tiny air sacs- Adapted to make gas exchange in
lungs happen easily and efficiently.
Features of the alveoli that allow gas exchange
• Moist, thin walls (just one cell thick)
• Massive surface area
• Capillaries:- excellent blood supply
Alveoli (copy)
• Alveoli are tiny air sacs found inside the lungs.
They are adapted to make gas exchange easy
and efficient.
Features of the alveoli that allow gas exchange
• Moist, thin walls (just one cell thick)
• Massive surface area
• Capillaries:- excellent blood supply
Gas Exchange
The gases move
by diffusion.
• High concentration to a low
concentration:
• Oxygen diffuses from the air in
the alveoli into the blood.
• Carbon dioxide diffuses from the
blood into the air in the alveoli.
Lung Dissection
https://www.twigworld.com/experiment/dissectionlungs-4180/#
The structure of the lungs
• Trachea= windpipe
• Held open by rings of
cartillage
• Trachea splits into 2 Bronchi
(bronchus)
• Bronchus branch off into tiny
branches- Bronchioles
• Alveoli at end of bronchioles
Draw and
label
Bronchus
Trachea
Bronchioles
Lung
Diaphragm
Alveoli
(“air sacs”)
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