John Snow, Henry Whitehead, the Broad Street pump,
Its only divided into 2 parts, the somatic nervous system and the autonomic nervous system.
You need friends? So go make some. Very simple, ask them how their day is going and that's a start
Answer: this question is opinionated so I'm just winging it for you-
I would not mind because I don't really want to have kids. If they were upset about it and it was affecting their mental health, I would then in that case feel empathy towards their pain and support them the best I could.