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randomposting

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Just in case you were wondering. [May. 29th, 2005|10:11 pm]
randomposting
[mood |uncomfortableuncomfortable]
[music |Vecchia Zimarra]

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.
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Comments:
From: nyguen9
2005-05-29 08:14 pm (UTC)
Wow.

That made me feel like I was still in lectures and not on summer break.

I now am stressing that next term starts on tues. Thanks for reminding me.
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[User Picture]From: randomposting
2005-05-29 08:20 pm (UTC)
LOL. My eyes glazed over no less then ten times before I was able to get through it.

LOL. Sorry! I... love you? :)
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From: nyguen9
2005-05-29 08:31 pm (UTC)
*grins* Well, I'm a Bio major, so I'm used to stuff like that.

It's ok. I only have two classes.
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[User Picture]From: randomposting
2005-05-29 08:42 pm (UTC)
You read this kind of stuff? Ugh. I would have dropped out of college quicker then I did. ;)
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From: nyguen9
2005-05-29 08:44 pm (UTC)
Well, I don't like it. But I only have two more years left!
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[User Picture]From: randomposting
2005-05-29 08:56 pm (UTC)
Thank the heavens.
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From: hymn
2005-05-29 11:34 pm (UTC)
my eyes glazed over after the first few words. i couldnt get through it. i didnt want to get through it. lol.
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[User Picture]From: randomposting
2005-05-30 12:05 am (UTC)
I understand. I would have yawned if my stupid body would let me.
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