Chapter 12 Terms

A narrowing of the arteries caused by thickening of the arterial walls and a buildup of lipid (primarily cholesterol) deposits. Reduces blood flow through the vessel, choking off the vital supply of oxygen and nutrients to the tissues served by that vessel.

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The fibrous sac enclosing the heart that holds the heart in the center of the chest without hampering its movement.

A blood-filled sac in the wall of an artery caused by a weak area in the artery wall.

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The system of blood vessels that services the tissues of the heart itself.

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A blood vessel formed by the merger of venules that transports blood back toward the heart. Have walls that are easily stretched, so they serve as blood reservoirs, holding up 65% of the body’s total blood supply.

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Microscope blood vessels between arterioles and venules with walls only one cell layer thick. The site where the exchange of materials between the blood and the tissues occurs.

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An increase in the diameter of blood vessles, commonly of the arterioles. Blood flow through the vessle increases, and blood pressure decreases as a result of this.

A graphical record of the electrical activity of the brain.