Author Topic: what I have learned today.  (Read 847158 times)

Feanor

  • It's mostly downhill from here.
Re: what I have learned today.
« Reply #1325 on: 12 August, 2016, 10:11:35 pm »
Yes, that's what I was saying.

G is irrelevant.
The hydrostatic head provided by h-rho-g is irrelevant, as demonstrated by lying in bed.

All that counts is the differential provided by the pump ( heart ).




Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1326 on: 12 August, 2016, 10:11:58 pm »
You can't get an erection in space.

I expect that's not true.
If the normal blood flow and pressure through my body required to keep me alive still works, then I can't see why other functions of blood pressure would not also continue to work.

All you lose is gravity, and the loss of h-rho-g hydrostatic head.
But if you are on Earth, lying flat on a bed, the h term in the equation becomes zero, and so g becomes irrelevant.
The pump ( heart )  still provides sufficient head for the purpose.

Now, if you were thrown out indo deep space ( perhaps after listening to Vogon poetry ), the pressure differential may indeed enhance your erection as in the manner of the manhood-enhancing vacuum pumps offered on the Internet (or is that just my Internet? ).

Anyways, enough of this...

Your blood pressure is much lower in zero-g.  That's one factor.  And the flow of blood and other fluids is significantly altered.  Think about it:  at 1G your heart needs to work against gravity to perfuse your brain.  It doesn't need to work nearly so hard in zero G.  During the first few days in space astronauts get facial and eye oedema, as the fluid pumping systems (you have more than one, and they interact) adapt to zero G.  All sorts of other stuff happens too that I can't remember.
Milk please, no sugar.

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1327 on: 12 August, 2016, 10:16:54 pm »
But but but... if it's impossible to get an erection in space then the only way all those sci-fi characters can procreate on their space ships floating through deep intergalactic space is by using sperm banks collected on various planets. Or are Vogons, Vulcans and Velogalacticas evolutionarily adapted to deep space zero-g sex?
Riding a concrete path through the nebulous and chaotic future.

Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1328 on: 12 August, 2016, 10:20:38 pm »
Maybe they freeze gametes ready for colonising the new planets?
Milk please, no sugar.

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1329 on: 12 August, 2016, 10:27:46 pm »
Gametes? Wot, like pheasants and partridges?
Riding a concrete path through the nebulous and chaotic future.

Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1330 on: 12 August, 2016, 10:28:24 pm »
Gametes? Wot, like pheasants and partridges?

Yeah, them. 
Milk please, no sugar.

Feanor

  • It's mostly downhill from here.
Re: what I have learned today.
« Reply #1331 on: 12 August, 2016, 10:32:20 pm »
You can't get an erection in space.

I expect that's not true.
If the normal blood flow and pressure through my body required to keep me alive still works, then I can't see why other functions of blood pressure would not also continue to work.

All you lose is gravity, and the loss of h-rho-g hydrostatic head.
But if you are on Earth, lying flat on a bed, the h term in the equation becomes zero, and so g becomes irrelevant.
The pump ( heart )  still provides sufficient head for the purpose.

Now, if you were thrown out indo deep space ( perhaps after listening to Vogon poetry ), the pressure differential may indeed enhance your erection as in the manner of the manhood-enhancing vacuum pumps offered on the Internet (or is that just my Internet? ).

Anyways, enough of this...

Your blood pressure is much lower in zero-g.  That's one factor.  And the flow of blood and other fluids is significantly altered.  Think about it:  at 1G your heart needs to work against gravity to perfuse your brain.  It doesn't need to work nearly so hard in zero G.  During the first few days in space astronauts get facial and eye oedema, as the fluid pumping systems (you have more than one, and they interact) adapt to zero G.  All sorts of other stuff happens too that I can't remember.

No, I don't agree.
( My background is in an industry where we design hydraulic systems to work on the surface and also and extreme depths of 20k psi, so there may indeed be differences I have not appreciated. )

At 1G whilst standing up, you have a closed circuit of fluid going up one way from the pump, down to the bottom, and then back up to the pump.
A loop of fluid in this system is entirely in equilibrium.
The hydrostatic head on the down leg exactly equals the hydrostatic head on the up leg.
So H-rho-g on one side of the system equals h-rho-g on the other,

The pump really does not have to work too hard: it does not need to work against gravity; because gravity both helps and hinders in equal measure. It helps by providing a down-force on one side of the pump, and hinders on the up-ward suction side of the pump.

So lying down on the job makes no difference.
And for the same reason, I think zero G is the same.

Someone should tweet that astronaut chap who was in the space thing and ask him.




Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1332 on: 12 August, 2016, 10:40:33 pm »
You can't get an erection in space.

I expect that's not true.
If the normal blood flow and pressure through my body required to keep me alive still works, then I can't see why other functions of blood pressure would not also continue to work.

All you lose is gravity, and the loss of h-rho-g hydrostatic head.
But if you are on Earth, lying flat on a bed, the h term in the equation becomes zero, and so g becomes irrelevant.
The pump ( heart )  still provides sufficient head for the purpose.

Now, if you were thrown out indo deep space ( perhaps after listening to Vogon poetry ), the pressure differential may indeed enhance your erection as in the manner of the manhood-enhancing vacuum pumps offered on the Internet (or is that just my Internet? ).

Anyways, enough of this...

Your blood pressure is much lower in zero-g.  That's one factor.  And the flow of blood and other fluids is significantly altered.  Think about it:  at 1G your heart needs to work against gravity to perfuse your brain.  It doesn't need to work nearly so hard in zero G.  During the first few days in space astronauts get facial and eye oedema, as the fluid pumping systems (you have more than one, and they interact) adapt to zero G.  All sorts of other stuff happens too that I can't remember.

No, I don't agree.
( My background is in an industry where we design hydraulic systems to work on the surface and also and extreme depths of 20k psi, so there may indeed be differences I have not appreciated. )

At 1G whilst standing up, you have a closed circuit of fluid going up one way from the pump, down to the bottom, and then back up to the pump.
A loop of fluid in this system is entirely in equilibrium.
The hydrostatic head on the down leg exactly equals the hydrostatic head on the up leg.
So H-rho-g on one side of the system equals h-rho-g on the other,

The pump really does not have to work too hard: it does not need to work against gravity; because gravity both helps and hinders in equal measure. It helps by providing a down-force on one side of the pump, and hinders on the up-ward suction side of the pump.

So lying down on the job makes no difference.
And for the same reason, I think zero G is the same.

Someone should tweet that astronaut chap who was in the space thing and ask him.

Err they did.  My son.  He asked Chris Hadfield.  Who said you can't get an erection in space.

The 'loop'  you described isn't really a closed circuit.  There are compensatory feedback mechanisms all the way round working in combination.  Relatively small episodes of vascular damage (say, in diabetics) can cause a failure of the erectile mechanism, whilst still allowing for the maintenance of blood pressure and brain function.  Another factor is the influence of baroreceptors - their function changes massively in space, to the extent that people tend to faint when they get back to Earth.

 http://www.nasa.gov/mission_pages/station/research/cciss_feature.html
Milk please, no sugar.

Torslanda

  • Professional Gobshite
  • Just a tart for retro kit . . .
    • John's Bikes
Re: what I have learned today.
« Reply #1333 on: 12 August, 2016, 10:44:58 pm »
You can disagree all you like but the spaceman said it can't happen. So it don't happen.

I wouldn't disagree with him. He spent however long in space. Not theorising.*

Do turkey basters work in zero g?



*Bit of a bastard if your fantasies as a teenager were based on Barbarella...

Edit. X posted
VELOMANCER

Well that's the more blunt way of putting it but as usual he's dead right.

Feanor

  • It's mostly downhill from here.
Re: what I have learned today.
« Reply #1334 on: 12 August, 2016, 10:45:08 pm »
OK, fine, I accept the evidence.
I can believe there are biological factors which make it different from a mechanical hydraulic system.
I never had to add blue pills to the mechanical hydraulic systems...

Kim

  • Timelord
    • Fediverse
Re: what I have learned today.
« Reply #1335 on: 12 August, 2016, 10:47:40 pm »
Not even Fernox?

Torslanda

  • Professional Gobshite
  • Just a tart for retro kit . . .
    • John's Bikes
Re: what I have learned today.
« Reply #1336 on: 12 August, 2016, 10:57:19 pm »
OK, fine, I accept the evidence.
I can believe there are biological factors which make it different from a mechanical hydraulic system.
I never had to add blue pills to the mechanical hydraulic systems...

There's some interesting research for when humans have to colonise space...
VELOMANCER

Well that's the more blunt way of putting it but as usual he's dead right.

Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1337 on: 12 August, 2016, 11:04:47 pm »
Are there hydraulic systems in which the flow away from the pump is active due to mechanically active vessels, but the flow back to the pump is a system of one-way valves through passive vessels?  Where the tubes expand and contract under chemical influences and peripheral systems can shut down altogether?  And in which the different areas of the same system operate at vastly different pressures from each other, and at different times? 

It would be interesting to know which mechanical systems are analagous to the human body, and how their feedback mechanisms regulate.

When you think about it, the times of highest demand and fluid through-put are likely to be when the body is vertical - flying or fighting.  But the system also needs to function when the body is horizontal or even inverted for short periods, as when you get your foot stuck in a tree and then fall, hanging upside down.  Although you probably can't do that for long.
Milk please, no sugar.

Vince

  • Can't climb; won't climb
Re: what I have learned today.
« Reply #1338 on: 13 August, 2016, 10:57:02 am »
May be there is a simpler reason... finding the necessary privacy on a space station.  ;D
216km from Marsh Gibbon

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1339 on: 14 August, 2016, 07:19:37 pm »
That there is no such thing as The Baptist Church. Each Baptist church is completely autonomous and governed by its congregation.
Riding a concrete path through the nebulous and chaotic future.

Paul

  • L'enfer, c'est les autos.
Re: what I have learned today.
« Reply #1340 on: 14 August, 2016, 10:09:11 pm »
Autonomous of what?

God?
What's so funny about peace, love and understanding?

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1341 on: 14 August, 2016, 10:31:18 pm »
Of everything apart from God, presumably! They have absolutely no hierarchy, all decisions are taken by the congregation, who also appoint their own minister, and there is no linkage other than two basic tenets – believers' baptism and congregational decision making – or coordination between churches. A decision taken by Xville Baptists might be totally contradicted by the decisions of Baptist Church of Yton. Autonomous in that sense. So I learned today from an ex-baptist.
Riding a concrete path through the nebulous and chaotic future.

Paul

  • L'enfer, c'est les autos.
Re: what I have learned today.
« Reply #1342 on: 14 August, 2016, 10:33:23 pm »
Splitters?
What's so funny about peace, love and understanding?

Ben T

Re: what I have learned today.
« Reply #1343 on: 15 August, 2016, 09:59:51 pm »
Would the reverse be true? i.e. if you went to a planet with high gravity, would it be the equivalent of having a f-off overdose of Viagra?

Ruthie

  • Her Majester
Re: what I have learned today.
« Reply #1344 on: 15 August, 2016, 10:07:55 pm »
Would the reverse be true? i.e. if you went to a planet with high gravity, would it be the equivalent of having a f-off overdose of Viagra?

It's hard to say, isn't it?  But we evolved to function optimally in 1G, so chances are there'd be problems.  If your willie was double the weight, would it need twice as much blood in it to get it off the ground, as it were?  If so, it would be even heavier ...  hmm ...

Or you could lie face-down with your willie hanging down, and see if gravity did the work for you?
Milk please, no sugar.

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1345 on: 15 August, 2016, 10:14:40 pm »
Is this why they call it the G-spot?
Riding a concrete path through the nebulous and chaotic future.

Re: what I have learned today.
« Reply #1346 on: 17 August, 2016, 02:27:05 pm »
Stepson was considering getting artificial turf for the lawn outside his new house, because "its just the same as a real lawn" (yes, he's that sort of person). I suddenly wondered how you prevented wind-blown soil from building up and plants taking root in it.

Vacuuming, apparently. You go out each weekend and vacuum your lawn.
<i>Marmite slave</i>

Re: what I have learned today.
« Reply #1347 on: 17 August, 2016, 03:03:36 pm »
I have seen Flemish women folk washing and vacuuming street paving in years gone by. They do like a good scrub over there.
Get a bicycle. You will never regret it, if you live- Mark Twain

Re: what I have learned today.
« Reply #1348 on: 17 August, 2016, 05:05:41 pm »
That Rain-X smells like grappa.

Cudzoziemiec

  • Ride adventurously and stop for a brew.
Re: what I have learned today.
« Reply #1349 on: 17 August, 2016, 05:51:36 pm »
Stepson was considering getting artificial turf for the lawn outside his new house, because "its just the same as a real lawn" (yes, he's that sort of person). I suddenly wondered how you prevented wind-blown soil from building up and plants taking root in it.

Vacuuming, apparently. You go out each weekend and vacuum your lawn.
Reality overtakes the surreal in a new way each day.
Riding a concrete path through the nebulous and chaotic future.