med prep 17

reynolds number

measure of tendency of turbelence in blood flow when greater than 2000, determined to be actual turbulent flow

blood pressure definition

the force excerted by blood per unit area of the vessel wall

vascular wall tension

tension. on blood vessel wall that develops in response to transmural pressure gradients and causes vascular smooth muscle and endothelial cells to stretch in all directions

blood flow autoregulation

the ability of each tissue to adjust its vascularresistace and to mantain normal blood flow during changes in arterial pressu

in parallel circuits in body what is benefit

overall less vascular resistance compared to series

hematocrit

the proportion of blood that is red blood cells

vasoconstrictors

norepinephrine, epinephrine, angiotensin 2, vasopressin(ADH), endothelin, calcium ions

vascular remodelling

adaptive growth in response to altered blood pressure or blood flow , rearrangement or growth of smooth muscle and endothelial cells, collagen fibers

vasodilators

histamine, magnesium ions, potassium ions, CO2, hydrogen ions