Unit Three: Gas Exchange Flashcards
Where are the lungs located?
In the Thorax which is the top part of your ‘body’
Where does the air you breathe in go through?
The trachea
What does the trachea split up into?
Two tubes (bronchi-each one is bronchus)
What do the bronchi split up into?
Smaller tubes called bronchioles
Where do the bronchioles end?
At small bags called alveoli
Where does the gas exchange take place?
The alveoli
What is the job of the lungs?
To transfer oxygen to the blood and remove waste carbon dioxide from it
What do lungs contain?
What happens here?
Alveoli
It is where gas exchange takes place
What are alveoli specialised for?
What do they have to do this?
To maximise the diffusion of oxygen
They have: An enormous surface area A moist lining for dissolving gases Very thin walls A good blood supply
What are villi?
Where are they located?
Tiny little projections
Inside of the small intestine
What do villi do?
Increase the surface area so that digested food is absorbed much more quickly into the blood
What do villi have?
A single layer of surface cells
A very good blood supply to assist quick absorption
