
Originally Posted by
Toxic_Avenger
IIRC BP is regulated based on mean arterial pressure- baroreceptors (pressure) and chemoreceptors (chemical composition of blood) are the feedback loop. The fluid circuit looks something like [Heart]Arteries>capillaries(where the magic happens)>veins[Heart] repeat (to be fair, the body has a dual circuit- one for blood to the body, and one for blood to the lungs to remove CO2, add oxygen). Like an oil filter on your car, the capillaries provide resistance.
There is a few factors to BP:
1) Regulation of heart rate by brain stem (medulla oblongata) to speed up / slow down heart rate (higher revs, higher oil pressure)
2) Regulation of heart stroke volume (imagine installing a bigger oil pump!)
3) Regulation of blood vessel resistance - often in conjunction with accessory muscles. This is why old people stand up and get a BP drop... latency in vasoconstriction. (oil pressure rises when you have a blocked oil return pipe)
4) Then there is endocrine hormonal/kidney regulation of blood volume- fit more 'oil' in the closed system and see higher pressures (hydraulics...)
Yeah, so when something breaks, all sorts of interesting things happen.
Complex but interesting subject.
Thanks for that! Most clear (and interesting) explanation I've ever had on this subject. Considering that in the recent past I've been interacting with lots of Cardiology type people, and was still fairly vague on the principles of the whole system, it's a great help, and it tickles my funny-bone to get an enhanced medical knowledge from a Land Rover forum!
What a diverse, brilliant, sometimes frustrating crew we have assembled here!
Back on subject - keep getting better Mario! And keep smiling - it confuses the heck out of them!
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1999 Disco TD5 ("Bluey")
1996 Disco 300 TDi ("Slo-Mo")
1995 P38A 4.6 HSE ("The Limo")
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