the circulatory system of the human body can be divided into two main branches, the _________ which goes through the lungs, and the _________ which passes through the rest of the body

blood travels away from the heart in vessels called______, and towards the heart in vessels known as ___________

in addition to arteries and veins, there is a third class of blood vessels, the ______

as arteries travel away from the heart their diameter ___, as veins get closer to the heart their diameter

a blood vessel connecting two other blood vessels, which creates a redundant pathway for blood flow is an

blood vessels have up to three layers, to varying degrees: in order from the outermost to the innermost

the tunica media consists primarily of

arteries are classified into three structural groups: in order from closest to the heart to farthest they are

arteries nearest the heart have the most _______ fibers, as they are subject to the most pressure

the contraction of the heart produces pressure waves in the arteries, the peaks of which give _________ blood pressure

muscular arteries have a thicker ____ ___ and fewer ____ fibers compared to elastic arteries

arterioles have the thinnest _____ ______, and control blood flow to the _______

small rings of smooth muscle called ______ _______ encircle the metarterioles and arteriole side of capillary beds.

capillaries have only one of the three possible blood vessel layers, the

precapillary sphincters regulate blood flow to the capillaries by a process called

of the three types of capillaries, the ones with tight junctions between the cells and no pores are

the small holes in fenestrated capillaries allow _____ to pass more readily through, and are found in glands, intestines and ____

approximately ___ of the blood in the body is in the veins

as the blood in the veins is under ________ pressure, veins have numerous ______

venous return to the heart is assisted passively by

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