again this is useful to add to

1. The Circulatory System
The circulatory system carries and transports the blood as
the body’s fuel supply around the body.

2. Functions
The basic function is to transport blood. Working together with
the respiratory system, this achieves the following:
The blood
carries oxygen,
water &
nutrients
through out the
body
And
transports
and removes
waste
Protection is provided
when antibodies that
fight infection are carried
in the blood. Blood can
clot to seal cuts and
wounds.
Body temperature is
regulated as blood
absorbs body heat
and carries it to the
lungs and skin
where it is released

3. Label diagrams
http://www.bbc.co.uk/schools/gcsebitesize/pe/appliedanato
my/0_anatomy_circulatorysys_rev1.shtml

4. The heart <3
Is basically a
very effective
pump
Like any other
muscle it contracts
and relaxes- when it
does this is called a
heart beat
There is 72 heartbeats
per minute for an
average adult at rest
Heart rate
increases with
exercise as the
heart is called
upon to supply
more oxygen to
the working
muscles
It has to
increase quite
considerably to
be able to
cope with
strenuous
exercise

5. Blood Vessels
There are three types of blood vessels within the circulatory system:
Arteries:
•Carry blood away from the heart
•Carry oxygenated blood at high pressure away from the heart through the aorta
•Thick, strong, elastic walls
•Smaller arteries are called arterioles
•They do not have any valves
•Your pulse is located in the arteries
Veins
•Carry deoxygenated blood back to the heart
•Contain valves to make sure the blood travels in the right direction when under lower
pressures
•Thinner walls that are less elastic
•Smaller veins are called venules
Capillaries
•The smallest blood vessels which connect veins and arteries
•Travel deep inside muscles and organs to supply the nutrients and oxygen
•Have walls only one cell thick to allow exchange of oxygen and carbon dioxide

6. Key terms
• Heart rate- the number of times your heart
beats in one minute, which is one contraction
and relaxation of the heart.
• Pulse- a recording of the rate per minute at
which the heart beats.

7. Key terms
• Heart rate- the number of times your heart
beats in one minute, which is one contraction
and relaxation of the heart.
• Pulse- a recording of the rate per minute at
which the heart beats.