Regarding "plasma"
As a rendering from whole blood this product is wholly unknown in the natural world. What I mean is that in the natural world there is no instance where this product would be found. Rendering "plasma" from blood is a wholly man made affair. It takes a carefully choreographed chemical and mechanical manipulation of whole blood to get this product. There is nothing in nature that does this.
When it comes to Watchtower's policy on "plasma" there is another thing that really shows how utterly ridiculous it is. There are two products you can render from "plasma" and those two products are known as cryosupernatant and cryoprecipitate. The supernatant is about 99% of the original "plasma" and the precipitate is the remaining 1% of the original "plasma". Watchtower leaves it to JWs to accept as much of either or both of these two products as they want, and JWs lap this stuff up too!. (See: Over 96% Accept 99%!
That means a JW can literally accept 100% of "plasma" so long as it is rendered into cryosupernatant and cryoprecipitate prior to transfusion.
There is nothing rational about Watchtower's blood doctrine. Nothing.