4.3.4 Flashcards
blood pressure requires the cooperations of 3 organs
heart
blood vessels
kidney
wha are the main factors influencing blood rate
cardiac output
blood volume
peripheral resistance
blood pressure calculation
CO X PR
what happens if one variable of blood pressure changes
they will be compensated by other variable
how is the resting heart rate mainteade
cardioinhibitory center via paraysmpthateic vagus nerve
what happens to cardiac output during stress
increases heart rate and stroke volume via sympathetic stimulation
what happens if there is a decrease BP for sympathetic actibity
increas in sympathetic activity»epinepherin in blood>increase contractility in cardiac muscle»>lowers ESV
which one is long term and which is short term
renal regulation
neural and hormonal controls
renal regulation=long term
neural and hormonal controls=short term
neural controls: vasomotor center
cluster of symphathetic neurons in medulla changing blood vessel diamter
maintains vasomotor tone (moderate constriction of arterioles)
input from baroreceptors, chemoreceptors and higher brain receptors
re
baroreceptors are located in
cartoid sinuses
aortic arch
large arteries in neck and thorax
when are baroreceptors intiated for high blood pressure
increases blood press stimulates baroreceptors, inhibit vasomotor center, causing arteriole dilation and venodilation
stimulate cardioinhibiotry center
when are baroreceptors intiated for low blood pressure
decrease in blood pressure
stimulates cardioacceleratory center
inhibit cardioihibiotry center
stimulate vasomotr center
what do baroreceptor in the cartoid sinuses protect?
protect blood supply to the brain
what do barorecpter in aortic reflex maintain?
maintain adequate blood pressure in the systemic circuit
where are chemorecptor loacted
cartoid sinus
aortic arch
large arteries of the neck
