What are the transport
vessels?
 Arteries
 Veins
 Capillaries
What is the function of an artery?
•
Arteries carry blood away from the heart.
•
Most arteries carry oxygenated blood.
•
Small arteries are referred to as arterioles.
What is the structure of an artery?
• An
artery is made up of
three layers:
1. Outer layer
2. Middle layer – thickest
layer, made up of elastic
fibers
3. Inner layer
How is the structure of an artery related to
its function?
 The
elastic walls allows the artery to
expand as blood passes through it
and then snap back again
(contract).
A
pumping mechanism to help force
blood through the blood vessels.
What is the function of a vein?
•
A vein carries blood toward the heart.
•
Most veins carry deoxygenated blood.
•
Small veins are referred to as venules.
What is the structure of a vein?
•
Veins contain the same three layers
as arteries except the layers are
thinner.
As a result, a vein can
hold a greater amount
of blood.
•
How does blood flow through a vein?
 Veins
lack the ability to expand and
contract like arteries.
 Inside
each vein are valves. Which
ensure one-way flow of blood.
What is the function of a capillary?
•
Capillaries are the site of
nutrient and waste
exchange between the blood
and surrounding tissue.
•
This exchange happens
by diffusion.
What is the structure of a
capillary?
 Capillaries
vessels.
 The
are the smallest blood
capillary wall is a single layer of
cells.
What pathway does blood follow
through the transport vessels?
Artery  Arteriole  Capillary network  Venule 
Vein
Video: Arteries, veins and capillaries
http://www.youtube.com/watch?v=VVJJHw_Ocp4
Draw Figure 9.8 page 306
Video: Arteries vs. Veins - What's the
difference?
http://www.youtube.com/watch?v=7b6LRebCgb4
What's the difference between arteries and
veins?
1.
2.
3.
4.
Direction of flow
•
Arteries carry blood away from the heart
•
Veins carry blood towards the heart
Color of blood
•
Arteries carry oxygenated blood (red)
•
Most Veins carry deoxygenated blue (blue)
Pressure of blood
•
Arteries have high pressure
•
Veins have low pressure
Veins have valves, arteries do not