题目内容
Osteoporosis in some elderly individuals is due to the decreased ability in the rate of protein formation.
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Both sutural and sesamoid bones are variable in nunber from person to person.
Vertebra and certain facial bones are called irregular bones because they have different number in all individuals.
Osteoblasts are the cells responsible for the resorption of bone tissues.
Sex hormones are important in bone tissue activity in that they promote the growth of new bone.
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