Balesir is spot on here. I'm not talking about anything special to 3E or 4e here. I'm talking about D&D as it has been since at least the late 1970s.
1st ed AD&D has hit point rule for physical injury, near-instant death from spider and snake venom, notoriously contested rules for falling damage, and later (in the Wilderness Survival Guide) suggests terminal velocity of (from memory) 1000' per round, which is something like a tenth of the minimal terminal velocity for a falling person.
1st ed AD&D also has highly defined leadership and influence modifiers which have been derived not from any systematic study of human affairs or of organisational psychology, but are posited based on the author's imagined conception of how human relationships and military discipline work.
It also has rules about the likelihood of pursuers giving up the chase in response to dropped treasure and food which are based not on any conception of reality, but upon their contribution to a certain sort of game play.
I would argue that the designer was trying to emulate reality in all these cases, but failing. But to be honest, I don't think its possible for us to come to agreement on this issue.