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Mrs. Brown was outside on her patio cleaning windows when she fell off her step ladder and fractured her right hip. She had emergency surgery with an open reduction and internal fixation of the right hip. Three days postoperatively, she asks you if she will have trouble going through airport security. What hasprompted her concern?

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Open (internal) reduction is the correction of the bone alignment through a surgical incision. It may include internal fixation of the fracture with the use of rods, wire, screws, pins, or nails, metal items that may trigger security alarms.

Alice and James adopted a 3-year-old child from a developing country. They noticed that her legs were bowed and there were some deformities in her cranial and pelvic bones. They brought her to a physician for a diagnosis. What was the likely diagnosis, and what was the treatment for the disorder?

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The child most likely has rickets, a con...

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Which of the following is the single most important stimulus for epiphyseal plate activity during infancy and childhood?


A) thyroid hormone
B) calcium
C) growth hormone
D) parathyroid hormone

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Compact bone is replaced more often than spongy bone.

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The pubic symphysis connects the two hip bones anteriorly and provides a little movement during childbirth. Choose the most appropriate tissue for this structure that is subjected to both pressure and stretch.


A) hyaline cartilage
B) bone
C) fibrocartilage
D) elastic cartilage

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Lengthwise, long bone growth during infancy and youth is exclusively through ________.


A) interstitial growth of the epiphyseal plates
B) calcification of the matrix of the zone underlying articular cartilage
C) the secretion of bone matrix into the medullary cavity
D) differentiation of osteoclasts into osteocytes

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In humans, the effect of the hormone calcitonin is to ________.


A) temporarily decrease blood calcium levels when administered in large doses
B) increase blood calcium levels by inhibiting osteoblasts
C) decrease mitosis of chondrocytes at the epiphyseal plate
D) increase blood calcium levels by stimulating osteoclasts

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At what age do bones reach their peak density?


A) early adulthood
B) at birth
C) early childhood
D) late adulthood

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A

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

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Which of the following statements best describes interstitial growth of cartilage?


A) Growth occurs in the lining of the long bones.
B) Chondrocytes in the lacunae divide and secrete matrix, allowing the cartilage to grow from within.
C) Unspecialized cells from mesenchyme develop into chondrocytes, which divide and form cartilage.
D) Fibroblasts give rise to chondrocytes that differentiate and form cartilage.

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B

The periosteum is a tissue that serves only to protect the bone because it is not supplied with nerves or blood vessels.

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Yellow bone marrow contains a large percentage of ________.


A) fat
B) elastic tissue
C) blood-forming cells
D) Sharpey's fibers

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Which bone would likely take the longest to heal?


A) thigh bone of a young individual
B) finger bone of a young individual
C) finger bone of an elderly individual
D) thigh bone of an elderly individual

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The term osteoid refers to the organic part of the matrix of compact bones.

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When an osteoblast becomes completely surrounded by its own matrix secretions it is referred to as a(n) ________.


A) osteogenic cell
B) osteocyte
C) chondrocyte
D) osteoclast

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The structure of bone tissue suits the function. Which of the following bone tissues is adapted to support weight and withstand torsion stresses?


A) trabecular bone
B) spongy bone
C) irregular bone
D) compact bone

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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 osteocyt...

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Skeletal remains are discovered at an archeological site. X-rays of the femur show evidence of a thin epiphyseal plate. This bone likely belonged to which of the following?


A) 8-year-old female
B) 25-year-old female
C) 60-year-old male
D) 18-year-old male

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Which structure allows the diaphysis of the bone to increase in length until early childhood?


A) lacuna
B) epiphyseal plate
C) epiphyseal line
D) osteon

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Sixty-five percent of the mass of bone is a compound called hydroxyapatite.

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