Additional Notes Module 4: Structure and Function of Blood Vessels Flashcards
____ by the heart flows through a series of vessels known as arteries, arterioles, capillaries, venules, and veins before returning to the heart.
Blood pumped
____ transport blood away from the heart and branch into smaller vessels, forming arterioles.
Arteries
____ distribute blood to capillary beds, the sites of exchange with the body tissues.
Arterioles
_____ lead back to small vessels known as venules that flow into the larger veins and eventually back to the heart.
Capillaries
The _____ system is a relatively high-pressure system, so arteries have thick walls that appear round in cross section.
arterial
The ____ system is a lower-pressure system, containing veins that have larger lumens and thinner walls.They often appear flattened.
venous
Arteries, arterioles, venules, and veins are composed of ____ tunics
three
three tunics known as the
tunica intima, tunica media, and tunica externa.
Capillaries have only a tunica ____ layer.
intima
The tunica _____ is a thin layer composed of a simple squamous epithelium known as endothelium and a small amount of connective tissue.
intima
The tunica ____ is a thicker area composed of variable amounts of smooth muscle and connective tissue. It is the thickest layer in all but the largest arteries.
media
The tunica ____ is primarily a layer of connective tissue, although in veins, it also contains some smooth muscle.
externa
Blood flow through vessels can be dramatically influenced by _____ and ____ in their walls.
vasoconstriction, vasodilation
Very small artery that leads to a capillary
Arteriole
Short vessel connecting an arteriole directly to a venule and bypassing the capillary beds
Arteriovenous anastomosis
Blood vessel that conducts blood away from the heart; may be a conducting or distributing vessel
Artery
Ability of a vein to distend and store blood
Capacitance
Veins
Capacitance vessels