Chapter 19 The Cardiovascular System: Blood Vessels

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1

What lines the lumen of all vessels?

endothelium

2

Contact tissue cells and directly serve cellular needs

capillaries

3

Sympathetic vasomotor nerve fibers control vasoconstriction and vasodilation of vessels

tunica media

4

regulate blood flow into true capillaries

precapillary sphincters

5

what determines if the precapillary sphincters are open or closed?

the tissue itself

6

Equivalent to cardiac output for entire vascular system

blood flow

7

force per unit area exerted on the wall of a blood vessel by the blood

blood pressure

8

opposition to flow

resistance

9

list three important sources of resistance

1. blood viscosity
2. total blood vessel length
3. blood vessel diameter

10

directly proportional to blood pressue

blood flow