Blood Pressure Flashcards
exam 3 (38 cards)
what factors influence bp
cardiac output
blood volume
total peripheral resistance
HR x SV is what
Cardiac Output
What regulates bp i the brain
medulla oblongata
cerebral cortex
what is within the medulla oblongata
cardiac control center CCCw
what are the 3 parts of the CCC
Cardiac acceleratory center
Cardiac inhibitory center
Vasomotor center
what does the cerebral cortex do
stiulate CAC and vasomotor if stressed and CIC if relaxing
What does ACh do in the PSNS
decreases SA node firing frequency.
where are ACh receptors located
in SA node, not in ventricels
what drug is in the SNS
neuroephanefrin
What increases duing SNS to regulate bp
CAC – and vasomotor center
what happens if CAC is increased
increase sinus rhythem (AS node firing freq)
increase HR
decrease in AV nodal delay
increase in force of contraction
increase in SV
what happens if vasomotor increases
b.v constrict
coronary ateries/skeletal m. arteries dilate
what increases in the PSNS
CIC
what does and increase CIC lead to
decrease in sinus rhythm
decrease in heart rate
increase in av nodal delay
what are the 2 ways to rapidly regulate blood pressure
baroreceptors and chemoreceptors
what do baroreceptors do
they are neurones that monitor the stretch of a b.v and send that info to the medulla oblongata
where are baroreceptors located
in the aortic arch and carotid sinus
what do chemoreceptors do
sense changes in pH and send that info to the medulla oblongata
where are artic bodies vs carotid bodies
aoric are in the aortic arch/right subclavian artery
carotid are in the external carotid artery
what does the negative feedback response of baroreceptors means
that an increase in bp means decrease in baroreceptors
what is the long term ways to regulate blood pressure
endocrime modulation
what are the 3 responses to reduced bp, that intend to raise the bp back up
renin-angiotensin aldosterone (RAA)
antidiuretic hormone
erythropoitin
what does Renin-angiotensin aldosteron do
it is an enzyme that makes angioteniogen int angiotensin II
effects of angiotensin II that is made by renin
stimulate release of aldosterone from adrenal gland
stimulate release of DDH
stimulate thirst to drink water and increase blood volume and then blood pressure
