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Blood…read more

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Circulatory System
A circulatory system is
essential for large
organisms so that all body
cells are supplied with their
needs and waste materials
are removed. A circulatory
system has three basic
components: a liquid
medium, a network of
vessels and pump.…read more

Slide 3

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Mammals all have a double circulation. This
means that, one other transport system
carries blood to most of the body and the
other carries blood between the heart and
the lungs
· The main advantage of this system is that fully
oxygenated blood can be kept separate from
that returning from the body which vastly
increases the efficiently of the system…read more

Slide 4

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We have 3 major types of blood vessels.
Arteries carry blood away from the heart to our
body organs. They usually carry oxygenated
blood. Their walls need to be able to stretch as
blood is forced along them and so their walls
are well supplied with elastic fibres. They also
have a thick layer of muscle to withstand high
pressures…read more

Slide 5

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Veins carry blood towards the heart. They
nearly always carry blood that has a low oxygen
content and fairly low pressure. Because of
this, they often have valves designed to
prevent backflow…read more

Slide 6

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Within our body tissues there is a vast
network of capillaries ensuring that no cell is
less than 0.5mm away. They are very narrow
with extremely thin walls so that oxygen can
easily diffuse through them…read more

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