BP Control Flashcards
True or False? SNS is most important for circulation control.
True
Where is the vasomotor center located?
Medulla and lower 1/3 of pons
The Vagus nerve is associated with ____.
PNS
Spinal cord and peripheral nerves are associated with _____.
SNS
All levels of spinal cord to preganglionic SNS neurons are located in what vasomotor region?
vasoconstrictor
Inhibition of vasoconstrictor activity takes place in what vasomotor region?
Vasodilator
What vasomotor region receives vagus and glossopharyngeal nerves and stimulates vasoconstrictor/vasodilator regions?
Sensory Area
How does the vasoconstrictor area constrict?
norepinephrine binds to alpha receptors activating constriction
SNS stimulates the _____ (gland).
adrenal medulla
True or False? In some tissues epinephrine will cause vasodilation via _____ receptors. Bronchial dilation and skeletal local dilation.
Beta
Cardioaccelerator is located in the _____.
medulla
____ primary function is to control minute by minute BP.
baroreceptor
Where in the carotid sinus are baroreceptors located and what nerve is it associated with?
Hering N fibers, glossopharyngeal
Where in the aortic arch are the baroreceptors located and what nerve is it associated with?
Hering N, vagus
True or False? Baroreceptors act on medulla to inhibit PNS and excite SNS.
False. Baroreceptors act on medulla to activate PNS and inhibit SNS.
Going from supin to sitting ____ venous return and BP.
decreases
True or False? Low blood pressure in the brain causes an extreme sympathetic response.
True
What is the CNS Ischemic response?
Tries to bring blood pressure up by shutting down all blood flow to non-essential organs.
_____ is increased urination in response to elevated BP.
Pressure Diuresis
____ is triggered by pressure in tubules.
Pressure Diuresis
_____ is triggered by pressure in atria and ventricles.
Pressure Natriuresis
______ is renal excretion of Na in response to elevated BP.
Pressure Natriuresis
What are the two major determinants of arterial pressure?
- daily sodium and fluid intake
- renal function curve
___ regulates MAP by short term mechanisms (ANS).
TPR
_____ regulates MAP by long term mechanisms (renal).
CO
CO increases MAP by direct _______ and indirect ______.
increased BP, autoregulation
What is the difference between salt sensitivity and salt insensitivity?
- insensitive means variety salt intake does not effect BP (normal renal function)
- sensitivity means salt intake level does effect BP (renal disease/dysfunction)
True or False? Small amount of Na accumulation can lead to significant increase in BP.
True
