Flashcards in 8.2 Blood Vessels Deck (12)
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1
What are some of the components in the blood vessels
Elastic fibres
Smooth muscle
Collagen
2
What do the arteries do
Carry blood away from the heart to tissue of the body
Carry oxygenated blood
3
What artery carries deoxygenated blood
Pulmonary artery carries deoxygenated blood away from teh heart to the to the lungs
4
What is teh structure if the arteries
Walls contain elastic fibres smooth muscle and collagen
Elastic fibres enables them to withstand high blood pressure
Smooth lining so blood flows easily over it
5
What are arterioles
Link arteries and capillaries
More smooth muscle and less elastin
They can construct or dilate
Vasoconstriction and vasodilation
6
What are the capillaries
Microscopic blood vessels that link the arterioles with the venules
Form an extensive network
Small lumen, only 1 blood cell at a time
7
How are capillaries adapted for their roles
Provide a large enough surface area for teh diffusion of substances
Total cross-sectional area is always greater than teh arterioles supplying them so rate of blood flow falls
Walls are single endothelial cell thick so good for diffusion
8
What do veins do
Carry blood away from the cells of the body and towards the heart
Carry deoxygenated blood
9
What vein carries oxygenated blood
Pulmonary vein from lungs to heart
Umbilical vein from placenta to fetus
10
What is teh structure of veins
They don’t have a pulse
Low blood pressure
Have valves to prevent the back flow of blood
Walls contain lots of collagen and little elastic fibre
Vessels have a wide lumen and a smooth thin lining so blood flows easily
11
What are venules
Link capillaries to veins
Have very thin walls with just a little smooth muscle
Several venules join to form a vein
12
