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Anat Lecture Test 3 - Functional Anatomy of Blood Vessels
Terms in this set (41)
Whole blood consists of _________ and _______ _______ in what ratio?
plasma, whole blood
__________ transports organic and inorganic molecules, formed elements, and heat
________ are essential for blood clotting and make up ___% of blood
______ _______ _______ are used for oxygen transport and make up ____% of blood
red blood cells, 99%
______ _______ ______ are used for defense mechanisms and make up ____% of blood
white blood cells, 1%
water flows where there is a larger level of ________
__________ allow exchange of waste products and nutrients
_______ typically are round vessels with thick walls
the smooth muscle layer in arteries contain elastic fibers
_______ are typically flattened or collapsed with relatively thin walls
the smooth muscle layer in veins contain elastic fibers
false - the smooth muscle layer is much thinner and does not contain elastic fibers
_______ have high pressure, while ______ have low pressure
what type of epithelium are blood vessels lined with?
simple squamous epithelium
______ _______ is the endothelial lining of a blood vessel
______ ______ is the muscular wall of a blood vessel
_______ ________ is the outermost connective tissue sheath of a blood vessel
tunica adventitia or externa
capillaries are the only vessel whose thin walls allow exchange between blood and tissue fluids
______ collect blood from capillary beds; the smallest venous vessels
______ are the smallest arterial branches in muscles and organs
what carries venous blood from skeletal muscles and body organs?
what distributes blood to skeletal muscles and body organs?
what carries blood directly to the heart?
what are 3 large veins?
-superior vena cava
-inferior vena cava
what carries blood directly away from the heart?
what are 2 large arteries?
Capillaries are just a tube of endothelial cells. They contain not tunica media or tunica adventitia
the diameter of a capillary is larger than the diameter of a single red blood cell
false - their diameters are about equal
__________ ______________ have a complete endothelial lining. they permit the diffusion of water, small solutes, and fat-soluble material into tissue fluids
___________ __________ contain windows or pores that permit rapid exchange of water and larger solutes between blood and tissue fluids
where are continuous capillaries found?
the brain and skeletal muscles
where are fenestrated capillaries found?
the kidney, endocrine glands
transport and diffusion can go in both directions
Because veins can't always overcome gravity, what are two functions veins have to help blood flow?
1. compartmentalize blood within veins so blood doesn't pool at the bottom
2. have valves that permit blood flow in only one direction, preventing backflow
what happens when someone has varicose veins?
the structure of the valves in the veins is losing integrity over age, which causes some backflow of blood -- compression socks help overcome this
at any given time, there is more blood in arteries than veins
at any given time ___/___ of blood volume is contained within the systemic venous system
at any given time, ___% of blood volume is in the heart
at any given time, ___% of blood is in systemic capillaries
_______________ is the contraction of smooth muscle in the walls of veins
loss of blood
if hemorrhage occurs, venoconstriction reduces the __________ of veins and ____________ blood to maintain blood volume in the arterial system
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