Veins hold the greatest volume of blood in the body--------and the heart along with the nerve glands in your throat.....
By a social fact, Durkheim is referring to facts, concepts, expectations that come not from individual responses and perferences, but that come from the social community which socializes each of its members.
In this metaphysical sense of origin, religion, like every social institution, begins nowhere. Rather, as Durkheim says, he is investigating the social forces and causes that are always already present in a social milieu and that lead to the emergence of religious life and thought at different points in time, under different conditions.