1. What blood group are you?
2. Do you give blood? Why/why not?
I never have. The first reason was that I tended to feel sick and faint when I even had enough for a blood test drawn, never mind a whole pint. Then I got over that, but I had slept with a bisexual man recently. Then a year had passed since I'd done that, and I tried to go give blood, but they wouldn't let me because I was anemic. It's vaguely on my to-do list to try to donate blood one of these days - before I get a tattoo (which will put me out of the running for another year).
3. Are you listed as an organ donor? Again, why/why not?
Yes, because once I'm dead I won't have any use for them, so someone else might as well have them. (Although when I think about this, I get grumpy because I imagine I probably wouldn't be considered a good candidate to receive a donated organ. It doesn't make me change my mind about donation, though, and probably wouldn't unless I were actually rejected as a candidate for an organ I needed.)
4. Would you donate an organ or other part of your body (eg bone marrow) while still alive?
I don't know. I have no philosophical objection, but I hate doctors and hospitals so it would be a significant stress on me, and so the reason would have to outweigh the stress. So I wouldn't do it for a stranger or for an organ or tissue bank, but I probably would do it for someone I cared a lot about. It's moot, though - I probably wouldn't be considered a good candidate for donation because of my size and health issues.
5. Would you consider leaving your body to medical science? Or maybe just parts of your body?
As janetmiles said: Sure; I won't have any use for it, and if someone else can, that's cool by me.