Control of Blood Pressure Flashcards
What accomplishes the minute-to-minute control of blood pressure?
The baroreceptor reflex
What exerts chronic control of blood pressure?
Kidneys via blood volume control
What values are modulated to keep MABP constant on a minute-to-minute basis?
HR
How does the baroreceptor reflex respond to a drop in blood pressure?
SNS will increase HR and ergo CO, increase contractility and ergo, contractility, causes vasoconstriction of arterioles and veins
What are the compliance vessels in the cardiovascular system? What are the resistance vessels?
Veins; arterioles
What is the effect of SNS stimulation on compliance?
Decreased
What is the only value that is regulated in the cardiovascular system?
MABP
What formula incorporates MABP, SV, SVR and HR?
MABP= HR x SV x SVR
Where are baroreceptors that regulate BF to the brain located? What is the afferent limb of this pathway?
Located in the carotid sinus and passed through glossopharyngeal n.
Where are baroreceptors that regulate BF from the heart to systemic organs located? What is the afferent limb of this pathway?
Located in the aortic arch and carried to the brain by the vagus nerve
What kind of receptors are baroreceptors? What stimulus are they responding to?
Pressoreceptors; measuring stretch
What type of relationship is observed between MABP and nerve firing rate?
Sigmoidal relationship
Do baroreceptors fire most in low or high blood pressures?
High
What is the response of baroreceptors to chronic high blood pressure?
Baroreceptors adapt to the elevated MABP and work to maintain pressure at the new elevated set point
Where do SNS nerve exits the medulla? PSNS nerves?
Lateral region; Medial region
