As a test case, I was just looking at a question here that was similar to one that had been asked and answered at biology.SE.
- Health.SE question: What causes body parts to fall asleep?
- Biology.SE question: What actually happens when my leg 'falls asleep’?
In this case, the rest of the question on the biology site explains that it is about the mechanism of a physiologic phenomenon, which is unambiguously on-topic there. The health.SE question may have been more related to “clinical” (for lack of a better word) aspects, i.e. “what sorts of predisposing physical and/or circumstantial conditions might lead to my foot falling asleep?” However, it wasn’t totally clear to me that the Health.SE question was not about mechanisms. Even if it was, I’m not sure if it should be off-topic for that reason.
Are questions about mechanisms of human physiologic and/or pathopysiologic phenomena on topic here?
More generally, is it OK if the scope of this site overlaps with biology.SE?