Ask Lemmy
A Fediverse community for open-ended, thought provoking questions
Rules: (interactive)
1) Be nice and; have fun
Doxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them
2) All posts must end with a '?'
This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?
3) No spam
Please do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.
4) NSFW is okay, within reason
Just remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either [email protected] or [email protected].
NSFW comments should be restricted to posts tagged [NSFW].
5) This is not a support community.
It is not a place for 'how do I?', type questions.
If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email [email protected]. For other questions check our partnered communities list, or use the search function.
6) No US Politics.
Please don't post about current US Politics. If you need to do this, try [email protected] or [email protected]
Reminder: The terms of service apply here too.
Partnered Communities:
Logo design credit goes to: tubbadu
view the rest of the comments
We were told that the arteries carry oxygen rich blood, that was red because of a high iron oxide content, away from the heart and lungs to the extremities of the body. At that point capillaries get involved, and it's really best not to worry too much here. Then the veins carry the oxygen depleted blood back to the heart and lungs to be reoxygenated, and that that blood appears blue through your skin. I think copper may have had something to do with the blue coloration, but that blood is also red in color, even if you managed to pull it directly into a vacuum tube. It just appears blue because of your skin or something.
Oxygenated blood is bright red, whereas deoxygenated blood is a darker red. And it looks blue because blue light doesn’t penetrate the skin as deeply as red light. The ones closer to the surface appear blue while deeper ones are purpleish due to the red light reflecting deeper.