OT-MGoBlog doctors I need your help
I'm currently in AP Bio and I can't find the answer to question. Should your blood pressure be higher when standing or sitting, why? Also should your blood pressure go up or down when you stand-up after laying down, why?
I've looked all over the internet and can't find an answer. Please help.
No doctor, but I'd guess lower when standing. The blood flows downward from your head, due to gravity, thus reducing the pressure to your upper body. This is why people feel light-headed when standing up.
I just made that up, but it makes sense to me. Good luck.
I also have no idea, but I'd assume it begins lower when you stand up and then the body overcompensates a bit by pumping hard for a while.
Studying for my PhD in biophysics here and that is correct. When you stand up you decrease the resistance of fluid flow in your blood stream as your arteries and capillaries and veins straighten. Thus standing decreases the fluid pressure require to flow blood. However, just like in your car when you push down on the gas peddle opening up the gas line, the RPM's of your body (Heart rate/BP) increases.
Oh, I see how it is. Edit your response to make me look like an asshole. Thanks.
/sarcasm
i realized my answer was only half right...i neglected the increase in effective weight. Yeah, the fluid resistance decreases but it must now combat increasing forces of gravity in order to circulate the blood.
Ok, so is your blood pressure higher or lower when you stand up?
The only problem with that thought process is that the blood needs to go back up. So, BP and HR are elevated when standing.
the biophysics PhD student told me I'm right, so I'm gonna just go ahead and pat myself on the back.
search:
Dear kcliff,
Blood pressure
is a dynamic variable and a blood pressure reading at any given point is only a "snapshot" of a "motion picture". The typical response to standing is a very brief slight drop in pressure followed by a slight increase above sitting after about a minute or 2. Standing still for a prolonged period may result in an additional drop in BP. In someone who is dehydrated there may be a pronounced drop in blood pressure with standing. Methods for elevating blood pressure would include increasing fluid and salt intake, exercise immediately before taking blood pressure and various medications (including real licorice which is not generally available in the US).
When you go from a seated position to a standing position there is a slight drop in blood pressure. This can often be indicated by seeing spots, or a short throbbing in the head.
Basically, if you're laying down then weight is evenly distributed so the heart doesn't have to work as hard to pump blood, but if you're standing up, then the heart has to work harder to pump blood to the brain. Which is why when people go from a sitting/laying down position o a standing one, rapidly, that spots or a headache occur, because the brain experiences a brief loss of blood.
When you stand up, BP will drop and then go up above "normal"
....is that this advice just cost you $1200.
What's your co-pay?
No co-pay, OBAMACARE for all!
Try also looking up Orthostatic blood pressure. This is a more specific search in reference to changing positions when checking ones blood pressure, most commonly from a sitting or laying position to a standing position.
AP Bio FTW. Is this stuff actually on the AP test? We haven't covered it yet.
Hey. I teach vascular physiology at UM. Excuse me if my answers have some "ifs." These are poorly written questions because they don't indicate what part of your body.
>Should your blood pressure be higher when standing or sitting, why?
In most parts of your body (arm, head), this shouldn't make much difference. The body will regulate blood pressure appropriately. Standing can caused increased blood pressure in the lower extremeties (feet), but I'm guessing that is not what your teacher is getting at.
>Also should your blood pressure go up or down when you stand-up after laying down, why?
If you stand rapidly, hydrostatic pressure will cause an increase in blood pressure in your lower extremeties and a slightly lower blood pressure in your head. High pressure in the legs can lead to blood pooling transiently in the veins, lowering blood flows and pressures to other areas. This causes the headrush.
Hope that helps.
I agree that this is a stupid question that doesn't make sense.
When I explain lightheadedness (orthostatic hypotension) to my patients, I just use the understandable "for a split second, until your body can adjust, gravity cause the blood to pool in youe legs when you first stand up, so you don't get enough blood to your head, so you feel a little woozy." You can actually save a few lives when patients are septic - their vessels are leaky and they can't really regulate their BP - by lowering the head of their bed so their head is below their body so it increases the blood/oxygen flow to their brain.
but I am a Cardiologist and this is by far the most apporpriate answer on this thread. +1 top you sir.
What is worse high systolic or diastolic pressure? Why?
Thanks a lot DICK!
It just be .org
Seriously dude study for yourself.
I know but I'm in the middlen of wisconsin with no computer so I have to do all this on my phone. I tried all the google links and they took forever to load so I figured mgoblog would be better and quicker.
Thanks for the help I'm done with questions.
but they just look up everything online. They don't have a drive to do the reading/studying themselves.
It's honestly pretty sad. I remember when I was in high school and actually had to read my books and look for the answer in the book and sometimes I could just look up the subject in the index and have an idea of where the answer was.
I wouldn't call this learning it's just regurgitation.
I understand your point but we learned this stuff I while ago so I was just trying to shed a few cob-webs. Plus for some dumb reason I didn't bring my book with me so I don't have that option.
RABBLE
Back in my day, I remember having to blow several times into my NES cartridge to get to play in my nintendo. These kids have it so easy with WIFI connected X Boxes and PS3's. Sometimes I had to get a wet rag out to wipe down my nintendo games. oh I also had to walk to and back from school barefoot, uphill and in the snow.
I remember having to refill the ink wells.
but if I had the chance to pick the brains of professionals in my field, I'd take it as well. I'd call his use of resources pretty clever, actually. What's the chance he could get a minute of these doctors' time IRL? Not that they're jerks, but they're busy guys with a lot of knowledge.
Systolic. High systolic pressures mean higher work loads for the heart. Higher diastolic pressures can mean better or worse ventricular filling, depending on whether they're due to high blood volume or stiff ventricles, respectively. So, there is such thing as "diastolic dysfunction," but I would much rather have that than systolic dysfunction any day.
Stepping away from the heart, systolic pressures are always higher than diastolic pressures, so if you're going to blow an aneurysm, systolic pressure is going to do it.
I disagree with you 100%.
A normal blood pressure is (as most know) 120/80. If you elevate the systolic pressure by 10 mmhg to 130 and keep the diastolic at 80 I would say the person doesn't even suffer from "High Blood Pressure".
If you increase the diastolic pressure by 10 and leave the systolic pressure alone you have 120/90 and that would be considered by every Dr. to be high blood pressure if it remained constant over time.
It is more dangerous for a person to have a high diastolic pressure. Not saying a high systolic pressure can't be problematic as well, but generally speaking a high diastolic pressure is worse.
but in most cases a higher diastolic pressure is worse.
Diastolic pressure is the pressure of the blood when the heart is rest. If it is high even when the heart is at rest there is a problem.
Google ain't got nuthin' on MGoBlog.
does more damage to your heart.
This thread is awesome. I wish I had thought of using MGoBlog to ask my Physics 140/240 online web homework questions when I was at UM. I wouldn't have had to befriend so many random students in my class to check if they had gotten a hold of someone that actually went to office hours to get the answers.
I do have a degree in physics...
i also gsi phys chem and gen ghem...
The answer to every Mastering Physics question is easily googled. I discovered this like the third week in and Physics became much less of a pain.
It is now, but it wasn't 6-7 years ago (the first year Mastering Physics was used).
mgoblog is awesome.
-don't get political!
What, prithee, does blood pressure have to do with politics?