Ground my dude! wanna know how I know! I checked the other answers on the other one :)
I believe it is a combination of polygenic inheritance and environmental factors. Several genes control the height in humans, giving an overall normal distribution. Environmental factors on the other hand such as nutrition smooth out the curve. It is therefore important to note that Human height is a quantitative, or metric trait, that is, a characteristic that is measured in quantity, and is controlled by multiple genes and environmental factors.
Hormones - they travel through the blood to other parts of the body. Hope This Helps!