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Chapter 15

Vascular System

anastomosis a natural connection between two vessels
arteries blood vessels that carry blood away from the heart
arteriole the smallest arteries; also called resistance vessels
baroreceptors sensory nerve endings in the aortic arch and carotid arteries that sense changes in pressure
capillary microscopic vessels that link arterioles to venules; site where nutrients, wastes, and hormones are exchanged between blood and tissue
circle of Willis circle of arteries at the base of the brain
conducting arteries the body's largest arteries; also called elastic arteries
diastolic pressure pressure within arteries when the ventricle relaxes
diffusion process by which molecules of a substance move from an area of higher concentration to lower concentration
distributing arteries carry blood to specific organs and tissues; also called muscular arteries
filtration process of removing particles form a solution by allowing the liquid portion to pass through a membrane
hypertension blood pressure consistently higher than 140 mmHG systolic over 90 mmHg diastolic
peripheral resistance resistance to blood flow resulting form the friction of the blood against the walls of the vessels
portal system system of vessels in which flood passes through a capillary network, a large vessel, and then another capillary network before returning to the systemic circulation
pressure gradient difference in pressure between two structures
sinusoid large permeable capillary found in the organs such as the liver, spleen, and bone marrow that allows for the passage of large cells and proteins
systolic pressure pressure in arteries when the ventricle ejects blood
tunica externa outer layer of blood vessel; composed of strong, flexible, fibrous connective tissue
tunica intima innermost layer of blood vessels; consists of simple squamous epithelium
tunica media middle layer of blood vessels; composed of smooth muscle and elastic tissue
vasoconstriction reduction in the diameter of a vessel
vasodilation increase in the diameter of a vessel
veins blood vessels that return blood to the heart; called capacitance vessels because of their capacity for storing blood
vena cava the body's chief vein, which serves to return blood to the heart
venule the smallest veins; serve to collect blood from the capillaries
Created by: lindstromjPN110