structure of the human gas exchange system 6.6/6.7

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what are the highly branched tubules called coming off from the lungs
Bronchioles
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what is the role of the trachea
It prevents the cartilage from collapsing as the air pressure inside falls when breathing in.
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what are the two divisions of the trachea called and their roles
Bronchi and they produce mucus to trap dirt particles
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what are the subdivisions on the bronchi called
bronchioles
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what does the elasticity of alveoli allow it to do
It allows them to stretch when filled with air and spring back when breathing out.
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When do the internal intercostal muscles contract
during expiration
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when do the external intercostal muscles contract
during inspiration
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what are the steps of inspiration
external intercostal muscles contract internal relax, ribs pulled upwards and outwards,diaphragm muscles contract and flatten, increased volume of thorax decrease in pressure in lungs, atmospheric pressure greater than in lungs air goes in
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what are the steps of expiration
The internal intercostal muscles contract external relax, ribs move downwards and inwards, diaphragm relaxes so it is pushed up against the abdomen, decreased volume of thorax increases pressure of the lungs, air forced out
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Card 2

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what is the role of the trachea

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It prevents the cartilage from collapsing as the air pressure inside falls when breathing in.

Card 3

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what are the two divisions of the trachea called and their roles

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Card 4

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what are the subdivisions on the bronchi called

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Card 5

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what does the elasticity of alveoli allow it to do

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