17). Describe the stages of endochondral ossification and nameat least one (1) bone that is formed using this process.
18). What effect does the hormone calcitonin have on bloodcalcium levels & how does it produce this effect? Explain.
19). What effect does parathyroid hormone have on blood calciumlevels & how does it produce this effect? Explain.
20). How is vitamin D synthesized and what effect does vitamin Dhave on blood calcium concentrations? Explain.
