Ch. 6 – Flashcards
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Which of the following is implicated in osteoporosis in older women?
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estrogen deficiency due to menopause
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Which of the following is not a function of the skeletal system?
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communication
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In newborn infants, the medullary cavity and all areas of spongy bone contain yellow bone marrow.
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False
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Which structure allows the diaphysis of the bone to increase in length until early childhood?
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epiphyseal plate
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Lengthwise, long bone growth during infancy and youth is exclusively through ________.
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interstitial growth of the epiphyseal plates
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At an archeological site you discover a bone that is cylindrical in shape, about one inch long and a quarter of an inch wide. Choose the correct classification
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Long
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Which of the following statements best describes interstitial growth of cartilage?
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Chondrocytes in the lacunae divide and secrete matrix, allowing the cartilage to grow from within.
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The cell responsible for secreting the matrix of bone is the ________.
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osteoblast
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What is the structural unit of compact bone?
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the osteon
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Choose the structures that most directly provide nutrients and remove wastes from osteocytes in compact bone.
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canaliculi
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Sixty-five percent of the mass of bone is a compound called hydroxyapatite.
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True
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Bones are classified by whether they are weight bearing or protective in function.
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False
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Wolff's law is concerned with ________.
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the thickness and shape of a bone being dependent on stresses placed upon it
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Cartilage has a flexible matrix that can accommodate mitosis of chondrocytes.
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True
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The trabeculae of spongy bone are oriented toward lines of stress.
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True
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The resilience of bone is thought to come from which of the following?
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sacrificial bonds in or between collagen molecules
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In some cases the epiphyseal plate of the long bones of children closes too early. What might be the cause?
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elevated levels of sex hormones
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Which of the following is a bone marking name that indicates an armlike bar of bone?
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ramus
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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?
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18 year old male
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Which of the following is the single most important stimulus for epiphyseal plate activity during infancy and childhood?
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growth hormone
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Closure of the epiphyseal plate stops all bone growth.
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false
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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.
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fibrocartilage
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For intramembranous ossification to take place, which of the following is necessary?
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Ossification centers form in the fibrous connective tissue membrane.
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What can a deficiency of growth hormone during bone formation cause?
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decreased epiphyseal plate activity
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Ossification (Osteogenesis) is the process of ________.
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bone formation
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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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false
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Bones are covered and lined by a protective tissue called periosteum. The inner (osteogenic) layer consists primarily of ________.
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osteoblasts and osteoclasts
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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?
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osteoporosis
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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?
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compact bone
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What kind of tissue is the forerunner of long bones in the embryo?
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Hyaline cartilage
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Choose the best location for obtaining a red bone marrow sample from a patient.
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head of femur