What are the transport vessels?  Arteries  Veins  C apillaries

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

 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. How is the structure of an artery related to its function?

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.

 Veins lack the ability to expand and contract like arteries.  Inside each vein are valves. Which ensure one-way flow of blood. How does blood flow through a vein?

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 are the smallest blood vessels.  The 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

Draw Figure 9.8 page 306

Video: Arteries vs. Veins - What's the difference?

What's the difference between arteries and veins? 1. Direction of flow Arteries carry blood away from the heart Veins carry blood towards the heart 2. Color of blood Arteries carry oxygenated blood (red) Most Veins carry deoxygenated blue (blue) 3. Pressure of blood Arteries have high pressure Veins have low pressure 4. Veins have valves, arteries do not