Answer:
Osteoblasts are responsible for formation and osteoclasts are responsible for resorption. Both processes are important to keep balance in bone density and matter. Through the different stages of life the balance varies.
-Childhood: Osteogenesis > Resorption
-Adolescence-30 years: Osteoblasts > osteoclasts
-30-50 years: balance between formation and resorption. >30 years, bone loss begins. (1% per year)
->50 years (in menopause and in andropause) there is greater bone resorption, increases that annual 1%, up to 10% per year; This activity is hormone dependent.
