Some bones contain marrow. Explain how the distribution of red and yellow marrow changes with age, and example of a bone.  Describe how sesamoid bones differ from other types of bone.  Describe how to get osteoporosis.  Why is regulation of calcium entry in and out of the bones important?  5. Name two bones connected by an interosseous membrane found in the crual/sural region.    6. What kind of joint is it when an interosseous membrane is present?

1. Some bones contain marrow. Explain how the distribution of red and yellow marrow changes with age, and example of a bone. 
   
   
   
2. Describe how sesamoid bones differ from other types of bone. 
   
   
   
   
3. Describe how to get osteoporosis. 
   
   
   
   
4. Why is regulation of calcium entry in and out of the bones important? 
   
   
   
   

5. Name two bones connected by an interosseous membrane found in the crual/sural region. 

6. What kind of joint is it when an interosseous membrane is present?