This is prompted by this answer and the description of blood chokes included. It states that
Cerebral blood flow (CBF) chokes involve restricting the flow of blood to the brain, thereby denying it of oxygen
As far as I have learned, the blood choke rather effects the veins, because arteria are under the muscles or within them and often quite well protected by them, while the veins are prominently positioned right under the skin, e.g. vena jugularis externa.
Therefore, the effect is that no blood can go out of the head or at least much more goes in than out, resulting in
- red head because of blood coming in, but not out
- higher pressure until no new blood may enter the head
- the oxygen within the blood getting used without proper replenishment
- unconsciousness due to lack of oxygen.
Therefore, aneurysm being the main danger because of higher pressure, but no problem for healthy people if the hold is not maintained more than ~1 minute thereafter, like backed up by the excellent answer of @DaveLiepmann there. I always found this to be very convincing compared to the "we primarily attack arteria", which lay under the muscular structures or are embedded.
Is that what blood chokes really work like? What is the actual mechanism going on?
EDIT to flesh this out a bit more:
I stumbled over this resource searching Wikipedia (full text and pdf available for free).
The findings are
That any effect of baroreceptors (receptors for the blood pressure) being irritated could not be shown. This quite popular theory seems to be simply wrong.
They claim it is due to compression of the carotid arteries.
My objection against this is that the method of pressure measurement (kind of a tube-collar with tubes in two different heights, depicted in the pdf file) and the data that are measured could - in my understanding, which is limited as I'm no physicist - equally like be explained by the theory presented earlier. Some phenomenon like the face getting read and the veins swollen even better.
Therefore, every (not necessarily that technical and medical) answer addressing this would be welcome.