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If a person has a herniated disk, sometimes surgery can relieve the pain that is associated with the condition. However, one side effect can be a loss in spinal flexibility. Why does this loss occur?

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The herniated condition generally result...

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Even before organs begin to form, rudimentary versions of the shapes of bones begin to form in a fetus due to the


A) activity of growth hormone
B) formation of secondary ossification sites
C) activity of chondroblasts
D) formation of an osteoclast
E) breakdown of hyaline cartilage

F) B) and C)
G) C) and D)

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Osteoporosis may result if the activity of osteoclasts outstrips the activity of osteoblasts.

A) True
B) False

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Cartilage-forming cells are referred to as chondroblasts.

A) True
B) False

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Bone is composed only of nonliving material.

A) True
B) False

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The coccyx is classified as a(n) ________ structure because it no longer has a function.

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A typical long bone has an epiphysis at each end, which can be thought of as


A) yellow bone marrow
B) a cylindrical hollow shaft
C) a tough layer of connective tissue
D) a site of water storage
E) an enlarged knob

F) None of the above
G) C) and E)

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The stability of a synovial joint is due largely to the presence of calcium salts.

A) True
B) False

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Bones continue to lengthen throughout childhood and adolescence because


A) a growth plate is present in each epiphysis until the late teens
B) the production of cartilage for a lengthening bone occurs primarily on the inside of the growth plate
C) ossification cannot occur until after puberty
D) primary ossification occurs until death
E) the activity of osteoblasts cannot be reduced until adulthood

F) A) and D)
G) C) and D)

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In which of the following bones are the teeth anchored?


A) mandible and zygomatic bones
B) mandible and maxilla
C) maxilla and zygomatic bones
D) mandible and sphenoid bone
E) sphenoid bone and maxilla

F) A) and E)
G) A) and C)

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The blood calcium level is regulated by two hormones: ________ causes an increase in blood calcium, whereas ________ causes a decrease in blood calcium.

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parathyroi...

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As osteocytes become enclosed in small chambers called lacunae, they still can communicate via ________.

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A clear fluid lubricates


A) ligaments
B) suture
C) fibrous joints
D) synovial joints
E) hyaline cartilage

F) B) and E)
G) D) and E)

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Stem cells in red bone marrow give rise to ________ and ________ blood cells.

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When bones undergo repair, the process begins with the formation of a blood clot known as a(n) ________.

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In which one of the following locations would one find a cartilaginous joint?


A) between the frontal and parietal bones
B) in a hinge joint
C) between the lower ribs and sternum
D) between the scapula and humerus
E) in a ball-and-socket joint

F) B) and D)
G) A) and B)

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Which one of the following separates neighboring vertebrae and also functions as shock absorbers?


A) ribs
B) palatine bones
C) intervertebral disks
D) intravertebral disks
E) osteons

F) B) and D)
G) A) and E)

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Which one of the following statements is TRUE regarding parathyroid hormone (PTH) ?


A) It stimulates the release of growth hormone.
B) It is released when blood calcium levels are high.
C) It has the same function as calcitonin.
D) It causes the breakdown of bone.
E) It causes decreased activity of osteoclasts.

F) D) and E)
G) A) and B)

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Vertebrae of the spinal cord are separated from each other by compressible, flat structures called ________.

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interverte...

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Late in puberty, the sex hormones signal the growth plate of a bone to stop growing; once this happens, the bone cannot get longer, but it can grow in width.

A) True
B) False

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