Recent comments in /f/askscience

RudiGoat t1_jdhkw12 wrote

Saw a video a while ago where an astronaut talks about the hassle of doing your business in space. Apparently you have to be really aware of your bowels because gravity isn't pulling on the waste and you don't get that feeling of "it's time to go" as strongly.

More generally, just knowing what I know about how the body works. Digestion is just a bunch of muscly tube shoving nutrients around. It's not as gravity dependent as you'd think. Might make your guts feel funky but doesn't affect a whole lot.

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GavUK t1_jdhkox2 wrote

I recently attended a presentation by Tim Peake (a UK astronaut) and, as well as the more commonly known issue of reduced sense of taste and smell, the other issue with eating in space is that you quickly feel full as gravity isn't pulling the food down to the bottom of the stomach so triggers the 'full' feeling and you have to get used to ignoring it.

Surprisingly though, you don't need gravity for your body to pull food down to your stomach when you swallow it.

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HiHoJufro t1_jdhkbzp wrote

>In the UK you can buy them in Selfridges food court.

Oh man, I just got back from London and didn't notice this when I checked out Selfridge's! Totally would have done that.

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bionor t1_jdhidjf wrote

In addition to that, I've read about a recent discovery where they either found a new type of dendrites that can send signals as well, or that the regular dendrites could.. IDK, I don't remember, but something along those lines. Was from a reputable source I believe. Do you know anything about it? What I remember for sure is that they said this new discovery meant there were more ways for information to be transferred than perviously known and that it could have implications for our understanding of consciousness.

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reboot-your-computer t1_jdhghmx wrote

If they did, it was probably due to the exposure to 0G for a few days before even getting there. The moon has gravity so we could assume that would prevent such things from occurring. A question this brings me to is how long does it take to fully regain those senses? Would the short time on the moon under some amount of gravity bring the senses right back or does it take time? On top of that, was this an effect we even understood when we were still putting people on the moon or was that too short of a time to really observe this?

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Cow_Launcher t1_jdhcj35 wrote

> ...gravity pushing that food down isn't really the main driving force. What does most of that job is layers of smooth muscle, that contracts and pushes things along without you even being conscious of it.

For anyone who wants to know more, this process is known as peristalsis.

Certain neurological conditions (e.g. Paralytic Ileus) can impact it and the results of this certainly prove that gravity doesn't play much of a part in the movement of food through the gut.

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tjeulink t1_jdhbcwb wrote

There's evidence that that is the role of the apendix, it functions as a refuge for healthy gut bacteria, even during antibiotic treatments.

And don't spread misinformation.

https://www.the-scientist.com/news-opinion/fecal-transfer-from-moms-to-babies-after-c-section-trial-results-68012

https://www.sciencedaily.com/releases/2019/09/190918131447.htm

>Scientists from the Wellcome Sanger Institute, UCL, the University of Birmingham and their collaborators discovered that whereas vaginally born babies got most of their gut bacteria from their mother, babies born via caesarean did not, and instead had more bacteria associated with hospital environments in their guts.

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Cow_Launcher t1_jdhb7fk wrote

The problem with aircraft is that the cabin air is very dry, (bleed air from the engines that has been run through airconditioning packs and is at least partly recycled). This dries out the mucous membranes in the nose, which in turn dulls your sense of smell.

Your sense of taste isn't standalone - it depends heavily on your sense of smell. So with that missing/impaired, food will taste bland or even entirely different to how it does on the ground.

Come to think of it, this may also be a factor in the ISS as well as the congestion problems they have. It would be interesting to know if they have humidifiers on board up there.

::Edit:: Yes they do, sort of! it's the Temperature and Humidity Control (THC) subsystem of the Environmental Control and Life Support System (ECLSS).

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TeeDeeArt t1_jdh8wd7 wrote

> Tldr: If you aren't a paramedic or higher, you shouldn't be administering insulin or dextrose/glucose either way.

Quickly checked current Australian and uk first aid resources (red cross training), and they do still seem to recommend that first aiders do it (giving sugar/sugary foodndrink) assuming the diabetic person is still responsive. I'd maybe be a bit more careful with wording when giving medical advise or first aid training online without being very specific as to where it applies.

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