How do you get body height?

You see, there is this gland in your brain, called the hypophysis. It produces the growth hormone, which makes our long bones (such as the bones, forming our arms) grow longer. Vitamin D also takes part in the process. When you sunbathe, you absorb it through your skin. Then through the blood Vitamin D helps the body absorb Calcium. Calcuim is in charge of the bones' strenght. The deficit of Vitamin D and therefore Calcium causes rickets, or osteoporosis by adults.

Hope I helped .. Biology makes me quite excited :-)