Exam 2 - part 3, veins

do arteries or veins have a greater capacity for blood

veins

what allows veins to expand easily

thin walls, flaccid, less muscular

what happens to veins when they are empty

collapse

do veins have high or low pressure

low

what are the smallest veins

postcapillary venules

t/f

postcapillary veins are more porous than capillaries and allow fluid exchange with tissue

true

what do the walls of veins consist of

endothelium, thin middle layer, few muscle cells and elastic fibers

outer connective tissue layer

what are the primary sites of emigration/diapedesis

veins and capillaries

muscular venules have one or 2 layers of ___ muscle in the tunica ___ and they have a thin tunica ____

smooth, media, externa

medium veins have a thin tunica ____ and thick tunica ____, the tunica ___ forms venous valves

media, externa, interna

varicose veins result in part from the failure of valves in which type of veins

medium

large veins contain ____ in all 3 tunics. They have a thin tunica ____ and a thick tunica ____

smooth muscle, media, externa

veins with very thin walls, large lumen, and no smooth muscle are called

venous sinuses

are venous sinuses able to perform vasomotion

no

what is the relative O2 concentration of systemic veins, what about pulmonary veins

low, high

what are some risk factors for varicose veins

hereditary, age, obesity, prolonged sitting or standing, venous insufficiency, pregnancy

what are varicose veins of the anal canal

hemorrhoids

what are some treatment options for varicose veins

elevate legs, compression socks, exercise regularly

sclerotherapy: inject solution to collapse veins

laser ablation: close the veins

surgery: remove veins

what are some complications of varicose veins

skin ulcers, blood clots, and infection

what are some prevention tactics for varicose veins

maintain healthy weight

exercise regularly

avoid prolonged sitting or standing

wear compression stockings

what is the order of the circulatory route

heart, arteries, arterioles, capillaries, venules, veins, back to heart

blood traveling through the simplest and most common circulatory routes passes through how many networks of capillaries from the time it leaves the heart until it returns

1

blood traveling through the portal system route passes through how many capillary networks before returning to the heart

2

what is the name of the point where 2 blood vessels merge

anastomosis

what is the name of the anastomosis where the artery flows directly into the vein bypassing capillaries

arteriovenous anastomosis

what is the name of the anastomosis where one vein empties directly into another

venous anastomosis

what is the most common anastomosis

venous anastomosis

what is the name of the anastomosis where 2 arteries merge to provide collateral routes of blood supply to a tissue

arterial anastomosis

is venous blockage or arterial blockage more serious? why?

arterial, venous have anastomosis that are more common and provide alternate routes for drainage