|Just in case you were wondering.
||[May. 29th, 2005|10:11 pm]
The vasovagal response is the development of inappropriate cardiac slowing and arteriolar dilatation. Vasovagal responses reflect autonomic neural changes: bradycardia results from sudden augmentation of efferent vagal activity, and hypotension results from sudden reduction or cessation of sympathetic activity and relaxation of arterial resistance vessels. Two different neural pathways are thought to be involved, one originating in the hypothalamus, the other in the heart. Direct hypothalamic activation of the medullary cardiovascular centres triggered by emotional stress or pain causes a vasovagal response (central type). The combination of a reduced central blood volume secondary to venous pooling or blood loss, and an increased inotropic state of the heart, may stimulate ventricular mechanoreceptors and provoke vasodilatation and bradycardia (peripheral type). Cardiovascular afferents originating from stretch receptors in various parts of the vascular tree sometimes induce opposite reflexes when compared with those from ventricular afferents. The depressor reflex involved in the peripheral type of vasovagal response originates in the heart itself and overrides normal baroreflex circulatory control; an antagonism between the control of volume and pressure on the filling side of the heart and the control system of arterial pressure becomes apparent. Vasovagal responses are not necessarily abnormal; the neural pathways involved in the vasovagal response are probably present in all healthy subjects who individually mainly differ in susceptibility.
Thanks, bah. *hugs* Biology tests? Agh. Nooooo fun.
Lol...*hugs back* Biology itself I don't mind so much. But I've gotten stuck with three hour and a half exams on the one day, which basically equals death. Biology, Logic and Ancient History are not at all fun when put together.
Ugh, I bet know. Ancient History sounds fun to m, though :)
Yeah, Ancient History is really quite fun - although I always end up with lines from The Goon Show (do you know it?) stuck in my head as I write the essays. Logic's quite spiffy too.
Which brings me back to shaking my fist at the evil, evil, evil world of biology.
...Out of curiosity, do you ever get bored reading the comments in your livejournal? :S
The gong show, you mean?
Only if they're stupid, but that rarely happens. Gives me something to do when insomnia hits.
Nonono... The Goon Show
. It was an old English radio program with Spike Milligan, Peter Sellers and Harry Secombe. At the moment we're doing Ancient Rome, and so I always end up with 'First, Caesar ruled with an iron fist...then, with a wooden foot. And finally, with a piece of string.' stuck in my head. Not handy when you're trying to write an analytical essay :POnly if they're stupid, but that rarely happens. Gives me something to do when insomnia hits.
Maybe if you foccused on the stupid ones, you'd cure your insomnia? ...Is there a cure for insomnia?
I've never heard of this so I have no frame of reference. Sounds like something I would like though!
Not really.. I mean, ti's insomnia.
Yeeeah...it predates Monty Python, and a lot of the Monty Python stuff was kinda...inspired by it. Keep an eye out for it - maybe you'll see it around.
Having never had insomnia, I wouldn't know. Isn't it just not being able to sleep? I'd say take sleeping tablets or something, but then you might sleep through bub's crying if he needs you :S
I shall keep an eye open on it.
And I wake up.. Usuall crying accompanies a poopie diaper which you can't sleep through. :)
You do that.
...And I am never having children. I'm sure they're lovely, but I'm far too selfish to be a mummy. The amount of time you have to spend on them...I'll never understand it.
Sorry, kinda inane statement.
LOL. It's an amazing experience, but not everyone is meant to be a parent. :) I wouldn't trade being a Mom for anything, but I understand why a lot of people aren't cut out for it.