Slides in this set
The lungs are like large
sponges, protected by the
ribs and surrounded by
the pleural membrane.
The air you breathe goes in
through the Trachea
The Trachea then splits
into two smaller tubes
called Bronchi, one going
into each lung.…read more
The lungs contain millions of alveoli.
The blood passing around the alveoli has
just returned to the lungs, so it is full of
The oxygen in the alveoli is a high
concentration, so it diffuses out through
the wall of the sac into the blood, which
has a low concentration.
The Carbon dioxide in the blood diffuses
into the alveolus to be breathed out.…read more
The alveoli are suited to this job
because they are only one cell thick,
which means that there is less distance
to diffuse through.
Because there are so many alveoli,
there is a large surface area for gas
The alveoli are permeable, which
means gases can pass through them
They have a good blood supply, to
maintain a high concentration