Slicker and newer release of “powers of 10” type of video [zooms into flower instead of a person though]:
https://www.youtube.com/watch?v=yvpPHoHh420
The first ~half of this video may be useful:
https://www.youtube.com/watch?v=D2cfP49KOno
Doesn’t include person/organ level, but still a nice demonstration — Structure of a chromosome and zoom in to DNA:
https://www.youtube.com/watch?v=57Q5V0HcIWU
May be useful in the context of basic brain biol:
https://www.youtube.com/watch?v=Zj3RxtJ_Ljc