13. Briefly descīibe how each of the following affect bone development, growth and maintenance: Calcium. Phosphorus, Protein, Vitamin D (calcitriol), sex hormones (estrogen & testosterone), gravity...

Extracted text: 13. Briefly descīibe how each of the following affect bone development, growth and maintenance: Calcium. Phosphorus, Protein, Vitamin D (calcitriol), sex hormones (estrogen & testosterone), gravity and activity. 14. Describe how Parathyroid Hormone and Calcitonin and the bones are involved in the negative feedback control of blood Ca2+ levels. 15. Differentiate compound and simple fractures. Describe the following fractures and identify the common population for: greenstick, comminuted, spiral, and compression. 16. Describe the basic steps of bone healing.