SBI3U/3C
Lesson 3.3 – the Respiratory System
December 4, 2018
The Circulatory System
The Circulatory System is the system by which
your body.
is moved
This allows
,
,
, and all sorts of other things, to be carried throughout your body
,
The Main Components
There are three major components to the circulatory system:
And there are three major places the blood travels to, through the blood vessels:
The heart is a
lungs, and then pumps that
. It moves
blood from the heart to the
blood to the rest of the cells in the body.
SBI3U/3C
Lesson 3.3 – the Respiratory System
December 4, 2018
The Lungs
The lungs move
in and out of the body. They are the site
where oxygen from the air enters the blood, and CO2 (waste product) leaves the blood.
Arteries
The arteries move blood
from the heart to the lungs, and
. They carry
blood
blood from the heart to the cells of the body.
Veins
The veins carry blood
blood from the lungs to the heart, and
Blood
Vessel
Artery
Vein
Capillary
Diameter
Pressure
THE HEART. They carry
cells of the body to the heart.
Valves?
Wall
Thickness
Oxygenated?
SBI3U/3C
Lesson 3.3 – the Respiratory System
December 4, 2018
The Respiratory System
•
•
The diaphragm is a
from the
located below the lungs which separates the chest
.
It is pulled
, which causes low pressure in the lungs, which
in through the nose or mouth.
The Nasal Cavity
•
Air which enters through the nose enters the
•
This has lots of small
the air.
,
•
It also has hairs and
, which are used
.
, which are used to
in the air.
SBI3U/3C
Lesson 3.3 – the Respiratory System
December 4, 2018
The Pharynx and Larynx
•
The pharynx is the
larynx.
•
The larynx is the
. It is two flaps of skin (the
)
stretched over the top of the trachea, which can be stretched tighter or looser to control the
pitch of
produced.
. Through here, the air passes through the
The Trachea
•
The trachea is the
•
It has
cleaner hose).
which
you breathe in down toward the lungs.
to prevent it from being crushed (think of a vacuum
The Bronchi
•
The trachea splits into two
•
These lead to the
•
They are smaller in
(singular is bronchus)
than the trachea, but share a similar
The Lungs
•
The bronchi
branch, until they terminate at the
•
The alveoli are clusters of
•
Their walls (epithelial tissue) are only
with the
that surround them.
, where they continue to branch, and branch and
, surrounded by small blood vessels.
, and they are able to exchange gases