Intro To CVR Flashcards
1
Q
What happens to the release of Norepinephrine if you stimulate a2 receptor
A
Inhibit the release of NE
2
Q
What happens if you block a2 receptors
A
You increase NE release! (Yohimbine does this)
3
Q
What happens when baroreceptors detect stretch (increased BP)
A
They fire MORE onto the inhibitory interneurons in the brain stem
=decreased SNS output and lower HR
4
Q
What happens if baroreceptors in the carotid detect less stretch (low BP)
A
They fire LESS on the inhibitory interneurons so MORE sympathetic signal gets through = increased HR
5
Q
Which is used for short term regulation: baroreflex or RAAS system
A
Baroreflex. Happens in about 3-5 heart beats
6
Q
What effect do beta blockers have on reflex tachycardia
A
BLOCK it
