Chapter 19 The Cardiovascular System: Blood Vessels
What lines the lumen of all vessels?
Contact tissue cells and directly serve cellular needs
Sympathetic vasomotor nerve fibers control vasoconstriction and vasodilation of vessels
regulate blood flow into true capillaries
what determines if the precapillary sphincters are open or closed?
the tissue itself
Equivalent to cardiac output for entire vascular system
force per unit area exerted on the wall of a blood vessel by the blood
opposition to flow
list three important sources of resistance
1. blood viscosity
2. total blood vessel length
3. blood vessel diameter
directly proportional to blood pressue