As a whole, skeletal dysplasias are not common. They affect one in every 4,000-5,000 births, although the incidence may be higher since the symptoms may not manifest until early childhood, when short stature, joint abnormalities or other complications arise.
Role of Hormones in the Body. Hormones play a role in nearly every aspect of the bodyâs day to day functioning. For example, they regulate sexual functioning, menstruation, pregnancy, bone health, and the bodyâs overall mood and emotions.
Page 883 in Mader (see fig. 49.2) does state that steroid hormones regulate gene expression (protein production) and that protein hormones activate particular chemical reaction series (an example is the protein hormone glucagon that activates the chemical reactions converting glycogen to glucose).