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Chapter 13 Vascular System

Horizontales
Outermost layer of an artery.
Carries oxygenated blood from the placenta to the fetus.
Smaller veins.
Regulated blood flow into capillary networks.
Middle layer of an artery.
Larger more permeable capillary.
Verticales
Carries blood from the fetus to the placenta
Prevent backflow of blood and are most numerous in veins.
Carry blood from the heart to the capillaries.
Force the blood exerts against the walls of blood vessels.
Carries blood from arterioles to venules.
Innermost layer of an artery.
Connection or joining of vessels that are artery to artery or vein to vein