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cardiovascular system
Blood vessels and hemodynamics
17
Anatomy
Undergraduate 1
02/16/2010

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Term
ateries
Definition
carry blood away from the heart to other organs
Term
arteriole
Definition
a small, almost microscopic, artery that delivers blood to a capillary
Term
capillary
Definition
a microscopic blood vessel located between an arteriole and venule through which materials are exchanged between blood and interstitial fluid
Term
venules
Definition
formed by groups of capillaries within a tissue which reunite to form small viens.
Term
veins
Definition
blood vessels that convey blood from the tissues back to the heart
Term
tunica interna (intima)
Definition
forms the inner linning of a blood vessel and is in direct contact with thhe blood as it flows through the lumen of the vessel.
(tunic= garment; interna or intima= innermost)
Term
tunica media
Definition
a muscular and connective tissue layer that displays the greatest variation among the different vessel types
Term
tunica externa
Definition
the outer covering of a blood vessel, consists of elastic and collagen fibers
Term
vasconstriction
Definition
decrease in diameter of the lumen of a blood vessel
Term
vasodialtion
Definition
increase in lumen diameter
Term
elastic arteries
Definition
the largest arteries in the body.
(aorta and pulmonary trunk)
Term
muscular areteries
Definition
medium-sized arteries. tunica media contains more smooth muscle and fewer elastic fibers
Term
precapillary sphincter
Definition
(to bind tight)
monitors the blood flow into the capillary
Term
capillary bed
Definition
network of 10-100 capillaries that arises from a single metarteriole
Term
sinosoids
Definition
(sinus= curve)wider and more winding than other capillaries
Term
capillary exchange
Definition
the movement of the substances between blood and interstitial fluid.
substances enter and leave capillaries by diffusion, transcytosis, or bluk flow
Term
respiratory pump
Definition
based on altering compression and decompression of viens
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