Osteoporosis is a common disease, affecting 50% of women over the age of 45 and 90% of women over the age of 75. It is due to loss of bone mass. How is bone mass decreased? Describe the condition of osteoporosis and explain the role of bone cells in terms of bone growth and bone remodeling. Be sure to explain what is happening in osteoporosis and that homeostasis is not being maintained.