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! ! amina96

Most gas exchanges... !
!
[ Note: I will be using this symbol ^, to explain the dash point above, and ^^
to explain the point (^) ]!
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1) Have a large surface area.
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- the many alveoli provide a large surface, so a faster…

Page 2

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! ! amina96

Gas Exchange - in the alveoli...!
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O --> diffused out from the alveoli!
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· across the alveolar epithelium !
· and the capillary endothelium !
· to the haemoglobin (in the blood)!
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CO --> diffused into the alveoli!
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· from the blood!
·…

Page 3

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! ! amina96

Goblet cells:
What does it do?
- It secretes mucus!
^ The mucus traps the microorganisms + dust particles
from the inhaled air...by stopping them reaching the alveoli!
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Smooth muscle:!
- found in the walls of the trachea, bronchi and bronchioles!
What does it do?!…

Page 4

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! ! amina96

Distribution of features in the mammalian gaseous
exchange system...!
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Part of the Cartilage Smooth Elastic Goblet Epithelium
lung muscle fibres cells
Trachea large C-
shaped Ciliated

pieces
Bronchi Smaller
pieces Ciliated


Larger
bronchiole
none
Ciliated


Smaller
bronchiole
none
Ciliated


Smallest
bronchiole
none
no cilia…

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