Transport in Animals - Blood Vessels

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  • Created on: 08-04-16 12:41
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Artery Vein Capillary
Large
amount,
especially in
arteries close
Elastic to heart. This
Small amount. Blood in veins at low pressure so no
tissue in allows wall None.
need for walls to be elastic.
wall to stretch
and recoil as
high pressure
blood pushes
through.
Relatively
large amount
in small
arteries and
arterioles.
Contraction
Smooth of this Small amount. All blood in veins travelling back to
muscle in muscle heart so no advantage to being able to divert to None.
wall reduces the different issues.
size of the
lumen which
can divert
blood from
one area to
another.
The wall is
only one
cell thick.
Cells are
Relatively
thin and
thick. Artery
flattened so
wall must be
wall is as
strong
thin as
enough to
Thickness Relatively thin. Blood in veins at low pressure so no possible
withstand
of wall need for thick wall. which
the high
allows
pressure of
transfer of
the blood
substances
flowing
by diffusion
inside them.
between
blood and
tissue fluid
easier.
Very smooth. Wall is
Endotheliu Allows blood made up of
m (inner to flow freely As arteries endotheliu
lining) and quickly. m only with
Rough wall no other

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The
resistance to thin
blood flow. endotheliu
Intact m and
endothelium pores
decreases speeds up
the the
likelihood of exchange of
thrombosis substances
(blood clot) with the
forming. tissues.
No valves
accept those
in aorta and Veins have valves which allow blood to flow towards
Presence of
pulmonary heart but not away from it. Necessary because of low No valves
valves
artery as pressure of blood in veins
they leave
the heart.
Tiny. Many
but only
8µm wide.…read more

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