Flashcards in Cardio 6 Deck (18):
estimates blood pressure
normal blood pressure at rest
s: less than 120 and
d: less than 80
elevated blood pressure at rest
s: 120-129 and
d: less than 80
high blood pressure stage 1 at rest
s: 130-139 or
high blood pressure stage 2 a rest
s: 140+ or
hypertensive crisis at rest
s: 180+ and/or
mean arterial pressure
inverse of (cardiac output x peripheral resistance)
factors that influence mean arterial blood pressure
blood volume, cardiac output, resistance, and distribution of blood between arterial and venous blood vessels
small changes in blood volume occurs from...
ingestion of food and liquids
changes in blood volume is resolved by...
local control of arteriolar resistance
matches tissue blood flow to metabolic needs of the tissue
-take precedence over reflex control by CNS
mediated by the CNS maintain mean arterial pressure and govern blood distribution for certain homeostatic needs such as temperature regulation.
particularly those that regulate salt and water excretion by the kidneys, influence blood pressure by acting directly on the arterioles and by altering autonomic reflex control
total resistance depends on..
radius and arrangement (series of parallel) of each vessel
myogenic auto regulation
Some vascular smooth muscle has the ability to regulate its own state of contraction; an increase in blood pressure causes the vascular smooth muscle in the wall of the arteriole to stretch, which then causes the vascular smooth muscle to contract, leading to vasoconstriction
Local control of blood flow is important in allowing...
individual tissues to regulate their own blood supplies