It’s more common for a person to be treated with their own stem cells which have been harvested and grown. Although I worked in a blood lab so it was mostly patients with leukaemia being treated. I am unfamiliar with treatment for other diseases.

As stated before blood is anuclear and has no ability to divide, the cells are released from the bone marrow into the peripheral blood. Plasma is just the liquid the cells sit in which contains blood clotting proteins. The coagulation cascade is a very interesting/complicated system that maintains blood clotting in the body. Plasma is often used to treat people who are having major bleeding episodes.

Blood still needs to be matched so the immune system of the recipient doesn’t attack and destroy it. Transfusion reactions can kill people.

Fecal biota are bacteria which are completely separate to the human body. They help us digest food but they aren’t part of our body.

My original point was that the only cell made to survive outside the human body is a sperm cell. Which is correct.

None of the other cell types would survive without human intervention.