Question | Answer |
Intima | the innermost layer of a blood vessel, endothelial lining |
Media | the middle layer of a blood vessel, contains smooth muscles tissue |
Adventitia | The outer layer of a blood vessel, very thick |
Vasoconstriction | when the smooth muscles constrict and reduce the diameter of the blood vessels |
Vasodilation | when the smooth muscle inside a blood vessel relaxes and the diameter increase |
Vasa Vasorum | the small blood vessels in the walls of larger vessles that supply the smooth muscle with nutrients |
Elastic Arteries | Conducting arteries, large vessels that carry large volumes of blood. Ex. aorta and pulmonary trunk |
Muscular Arteries | Distribution arteries,Transport blood to the body's skeletal muscles and internal organs |
Arterioles | control the blood flow between arteries and capillaries |
Capillaries | the smallest and most delicate blood vessels, hey permit exchange between the blood and the surronding interstitial fluid |
Sinusoids | cappilaries found in the liver that have larger pores |
Capillary Bed | (or plexus)an interconnected bed of capillaries |
Precapillary sphincter | a band of smooth muscle that guards the entrance to each capillary |
Arteriovenous Anastomosis | direct connections between arterioles and venules |
Venules | the smallest veins, collect blood from cappillaries |
One-way Valves | valves in veins so that blood flows up and does not flow down with gravity |