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Anatomy Ch. 20

QuestionAnswer
The vasa vasorum of very large blood vessels extends through the: tunica externa
The specific amount of blood entering the capillaries per unit time per gram of tissue is called __. perfusion
The average cardiac output at rest is 5.25 liters per minute and may substantially increase during exercise. T or F? true
During pulmonary circulation, __ exits the alveoli of the lungs and enters into the blood. oxygen
The __ elastic lamina in the walls of muscular arteries separates the tunica media from the tunica externa. external
Which arteries have a greater amount of smooth muscle in their walls to enable better vasoconstriction and vasodilation? muscular arteries
Which chamber of the heart receives blood from the inferior vena cava? right atrium
What methods are used to pass materials through the walls of continuous capillaries? simple diffusion and pinocytosis
A __ __ includes two or more veins draining the same body region. venous anastomosis
An __ __, or shunt, transports blood from an artery directly into a vein, bypassing the capillary bed. arteriovenous anastomosis
What layer of the blood vessel wall is composed of areolar c.t. containing elastic and collagen fibers? tunica externa
The space within a vessel through which blood flows is the: lumen
Relaxation of the __ __ allows blood flow into the true capillaries of a capillary bed. precapillary sphincter
The coronary arteries in the heart wall are examples of __ __ arteries b/c their anastomoses are so tiny that the arteries may almost be considered end arteries. functional end
Veins tend to form many more anastomoses than do arteries. T or F? true
Created by: khinson
 

 



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