Question

In bone 

A. Osteoclasts are responsible for bone resorption. 

B. Osteoclasts are inhibited by parathyroid hormone. 

C. Maintenance of normal calcium content depends on exposure to mechanical stress. 

D. Strontium ions may substitute for calcium ions. 

E. The width of the epiphyseal plate is an index of its growth rate.

Answer 1

A. True They contain an acid phosphatase. 

B. False They are stimulated to resorb bone with release of calcium ions. 

C. True Calcium is released from bone during bed rest and inactivity. 

D. True This may subject bones to increased radioactivity. 

E. True The epiphyseal plate is relatively wide during childhood.