Cell respiration and oxidation involves exactly zero forms of
combustionfire.If aliens exist they would probably have many things just as strange. They would also need a way to harvest energy via some cycle. It is possible they would require even more reactive substances to live.
We're also reliant on water and are mostly made out of it. water is such a "universal solvent", it's quite OP. It dissolves so much, that we don't even think about it
We're death breathers, but also basically have acid blood like xenomorphs
I guess this is why rich ghouls and professional athletes are into cryotherapy for anti-aging. Like that weird billionaire who also stole blood from his son. What's the consensus on that, is it a grift or do serious scientists think you can really extend your life by regularly locking yourself in a cold chamber or dunking yourself in an ice bath for a few minutes every day?
Grift. Same for blood boys. The meritocracy is just a lie, the rich are dumb as shit like everyone else.
Something I learned recently on another topic: The human body is 67% oxygen by atomic mass.
You don't breath poison. You are poison.
Chemical damage to our bodies mostly consists of both oxidation and Maillard-like reactions. So we're both slowly burning and getting cooked!
I'm just going to ask because I think this is true but I'm not certain and nobody's talking about it. Antioxidants are BS right?
The dietary antioxidant fad is mostly BS. They're supposedly meant to counteract oxidative stress and specifically free radicals. Both of those things are part of a healthy life and you would die without them. So any real impact is not so simple as "just counteract those bad things". Dietary antioxidants don't always lead to higher intracellular antioxidant levels, either.
Some dietary antioxidants so lead to higher intracellular levels and may help buffer oxidative stress (like from exercise) but there isn't much evidence that it doesn't just boil down to "eating your vegetables is good for you".
Sleeping more (and in tact with your circadial rhytm) and drinking more water keeps the radicals at a lower level tho, keeping you healthier in age. That or fasting like a fakir your whole life, keeping your cells in an "safe energy and clean up" mode.
Edit: radicals, not oxidants
You need oxidants to live. Issues stemming from oxidants are about levels of free radicals getting too high in the wrong places for too long.
Getting good sleep, eating a balanced diet, reducing stress, and getting enough exercise are the best ways to reduce the chances of such a scenario. Realistically, these things are also just a way to maximize wellness and health overall and it is probably not very useful for most people to think of this in terms of oxidation.
Oxidative Stress is not part of a healthy life. It's literally stress on your cells ability to respirate and detoxify. It causes DNA fragmentation in low amounts and apoptosis/cell death among other serious biological complications like cancer with high enough severity.
Oxidative stress happens every time you exercise. People need exercise to have better health. Oxidative stress is actually a necessary part of a healthy life.
A bit Overblown, but not really bs, from what I researched a bit ago
It's not true. It's sophomore high school biology students making memes about things they only have a cursory understanding of.
When we and other known organisms take energy from food we are actually taking molecules with higher-energy electrons, converting them into the high-energy molecules our cellular processes can use to do make cell things happen, and producing very similar molecules with lower-energy electrons. Rather than infinitely accumulating these molecules, our cells dump low-energy electrons onto another molecule that is amenable and thereby convert into a molecule ready to accept high-energy molecules from food (with a bunch of steps in between).
For us, as aerobes, the electron acceptor at the end of respiration is oxygen.
Oxygen as an electron receptor is newer than several others. Anaerobes came first. It was only after photosynthesis had produced a ton of atmospheric oxygen that it became a viable option, really. But it O2 is a comparatively good electron acceptor because the process in which it accepts those electrons allows cells to grab quite a bit of energy from that last step. It is fairly "electron needy" compared to earlier electron acceptors.
So, basically, aerobes get more energy per food unit (sugar molecule) than the vast majority of other creatures. You need it to live because it is an essential part of how your cells get food, namely, how it can recycle molecules at the last step of the respiration cycle.
talking out my ass, I'm guessing its because oxygen is an energetic and highly reactive element, and therefore it can do lots of things and it does them really well (or at least strongly), or in general was just the best most direct means to accomplish the energy intensive tasks that were required given the biosphere we evolved in? I'm not sure how common/ vital oxygen consumption was before that one mass extinction where algae became overabundant and oxygenated the atmosphere and caused a mass extinction, it could have been a result of adaptation to that new condition- though I doubt this is the case
Organisms need some oxidizing agent to respire. We use oxygen because it's very highly reactive and thanks to photosynthesis is goddamn everywhere.
Some use radiation tho.
https://www.sciencealert.com/bacterium-lives-off-nuclear-energy-alien-life-europa
And maybe related https://en.m.wikipedia.org/wiki/Radiotrophic_fungus
Would be rad if we could live off space radiation.
Can you explain that first part in more detail? I really know nothing about this and I'm curious to hear more.
In Becky Chambers' Wayfarer series, there is a species who actually breathes methane. The focus though is less on how that actually happens and more on how they navigate as the only species for whom oxygen is toxic. It's a great series, btw. It's a not-quite-as-optimistic as star trek future, but still optimistic and with a vast range of species who are all intermingling as learning how to get along.
