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Explain why swimming is not generally recommended as an exercise to prevent osteoporosis.

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Mechanical stress and gravity ...

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Short,irregular,and flat bones have medullary cavities in order to keep the weight of the bones light.

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Select the bone disorder in which bone resorption outpaces bone deposit,leaving the person with thin and often very fragile bones?


A) osteomalacia
B) rickets
C) Paget's disease
D) osteoporosis

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Compare the function of the organic materials in the bone matrix with the function of the inorganic materials in the matrix.

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The organic matrix contributes...

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For intramembranous ossification to take place,which of the following is necessary?


A) Ossification centers form in the fibrous connective tissue membrane.
B) A bone collar forms around the cartilage model.
C) A medullary cavity forms.
D) The cartilage matrix begins to deteriorate.

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Bones are classified by whether they are weight bearing or protective in function.

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Each consecutive bone lamella has collagen fibers that wrap in alternating directions.

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The hormone that is primarily involved in the control of bone remodeling is calcitonin.

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Cartilage has a flexible matrix that can accommodate mitosis of chondrocytes.

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Ossification of the ends of long bones ________.


A) is a characteristic of intramembranous bone formation
B) involves medullary cavity formation
C) takes twice as long as diaphysis ossification
D) is produced by secondary ossification centers

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The trabeculae of spongy bone are oriented toward lines of stress.

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Prevention of osteoporosis includes adequate intake of ________.


A) potassium and vitamin D
B) vitamin D and chloride
C) calcium,and vitamin E
D) calcium and vitamin D

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The process of bones increasing in thickness is known as ________.


A) closing of the epiphyseal plate
B) appositional growth
C) epiphyseal plate closure
D) concentric growth

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Compare how nutrients reach individual osteocytes in compact bone and in spongy bone.

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In spongy bone,nutrients reach osteocyte...

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