nervous regulation of the circulation Flashcards
What are some of the effects of the autonomic nervous system on the cardiac system?
redistribute blood to different areas, affect heart rate, can rapidly change the arterial blood pressure.
The SNS allows for ________
rapid changes
The SNS can innervate all vessels except_______
capillaries, precapillary sphincters, metarterioles
SNS stimulation of veins does what to there volume?
decreases volume to increase blood flow.
what happens during hypovolemic shock?
low blood volume
what happens during vascular shock?
extensive vasodilation and drop in BP
what happens to cardiogenic shock?
heart stops working
vasoconstrictor area of vasomotor center is responsible for?
maintains normal vasomotor tone, contributes to maintenance of BP
how does the vasodilator area of the vasomotor center work?
it inhibits the vasoconstrictor area
what does the adrenal medulla release and what effects does the material released have on the body? What stimulates the release?
it releases norepinephrine and epinephrine, primarily causes vasoconstriction, triggered by SNS
what two centers in the brain normally work together to regulate blood flow in the body?
cardiac center and vasomotor center
what response is the most rapid in regards to blood pressure?
nervous system
what happens to create an increase in arterial pressure?
stimulation of vasoconstriction and cardioaccelerator, and reciprocal inhibition of PSNS vagal signs.
what do baroreceptors sense to regulate blood flow?
they are pressure sensitive and respond to stretch or lack of stretch in vessel walls
what is the most powerful activator of the SNS vasoconstrictor system?
the CNS ischemic response
