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Pathway of air
Lesson 1: Pathway of air & Gaseous
exchange
Lesson 2: Gaseous exchange &
mechanics of breathing
* Understand the pathway of air through our respiratory system (3-
4)
** On a diagram identify the different parts of the respiratory
system and their functions (5-6)
*** Explain how the features of the alveoli assist gaseous exchange
(7-9)
Big question: Why is oxygen so
important?
Starter: sort the following key terms for
the cardio-respiratory system
Respiratory
system
Cardiovascular
system • Mouth/nose
• Left ventricle
• Trachea
• Bronchi
• Bronchioles
• Systolic
• Lungs
• Stroke volume
• Heart
• Alveoli
Clue: Cardio = heart
Only 4 fall under cardiovascular
Respiratory system
(Lungs)
Cardiovascular system
(Heart)
• Mouth
• Trachea
• Bronchi
• Bronchioles
• Alveoli
• Left ventricle
• Systolic
• Stroke Volume
Mouth
Nose
Trachea
Bronchi
Bronchioles
Lungs
Alveoli
Diaphragm
Video
https://www.youtube.co
m/watch?v=8NUxvJS-_0k
Task: Label the diagram
Key terms
Trunk = Trachea
Branches = Bronchi
Twigs = Bronchioles
Leaves = Alveoli
Mouth & Nose We breathe in through our nose and mouth. Trachea The air travels into the trachea. The inside of the trachea is covered in small hairs called cilia. The trachea is kept open by rings of cartilage.
Trachea
What is the function of the
cilia?
Bronchi
The trachea splits left and
right to enter the left and right
lungs. They then split into
smaller and smaller bronchi.
Bronchioles
Small bronchi divide into
bronchioles which are very
narrow tubes less than 1mm
in diameter.
Alveoli
Diffusion:
Is the movement of gas from an area
of high concentration to an area of
low concentration
Name 3 features of the respiratory system
and explain how it assists in gaseous exchange
(6 marks).
Large surface area
Moist thin walls (1 cell thick)
Lots of capillaries
Short distance for diffusion