Theme 27 - Cardio 4 Flashcards
what does the cerebral circulation do?
autoregulates between 60-130 mmHg
What do baroreceptors do?
sense receptors -sense stretch of elastic artery wall in systole
where do the baroreceptors exist?
connective tissue around carotid sinus
what do the nerve impulses from baroreceptors do as MAP rises?
increase
if pressure at the carotid sinus rises above a normal value, what does the baroreceptor do?
input acts to lower arterial pressure
what are the 3 humoral blood pressure control mechanisms?
renin
atrial naturetic peptide
vasopressin
Which humoral blood pressure mechanism controles regulation of mean arterial pressure?
a) renin
b) atrial naturetic peptide
c) vasopressin
renin
Which humoral blood pressure mechanism regulates sodium, blood volume, and arterial blood pressure?
a) renin
b) atrial naturetic peptide
c) vasopressin
atrial naturetic peptide
Which humoral blood pressure control mechanism regulates blood volume and arterial pressure?
a) renin
b) atrial naturetic peptide
c) vasopressin
vasopressin
what can renal artery stenosis cause?
hypertension
what does acute activation of baroreceptors and humoral mechanisms do when blood pressure falls?
hemorrhage
What pressures are hypertensive(high blood pressure)?
140/90
what is hypertension caused by ?
increased peripheral resistance and increase with age
What is autoregulation?
keep flow to organs constant in spite of changes in MAP - contriction and dilation
what receptor does rapid neural regulation?
baroreceptors
