I understand the rudiments however when I think of a scenario like this I get lost: Assuming nutrition/sleep is adequate, there is no hgh deficiency and growth plates of the leg bones are very much open; how come in some cases the leg bones do not continue to grow? I've read a lot of cases where a teen stays a certain height and stops growing for years before their growth plates fully close. Readrothbard says he was 5'6 from 13-17 and only grew half an inch after. If hgh is constantly being secreted and transported all over the body, how can for example the arm bones grow in length but the leg bones not ?