Which of the following statements about bone remodeling and repair is correct?
A. Bone remodeling involves removal of old bone by osteoblasts.
B. The rate of bone remodeling increases in the elderly.
C. Exposure of a bone to increased mechanical stress can lead to bone remodeling.
D. Bone remodeling does not involve the activity of the osteoclasts and the osteoblasts.
E. As a long bone increases in diameter, the size of the marrow cavity decreases.
C
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Gigantism and acromegaly occur as a result of
A) overproduction of parathyroid hormone. B) insufficient secretion of epinephrine. C) overproduction of growth hormone. D) overproduction of mineralocorticoids. E) insufficient production of estrogen.
Food is normally prevented from entering the nasopharynx by the
A. elevation of the epiglottis. B. elevation of the soft palate. C. constriction of the esophagus. D. depression of the hard palate. E. closure of the nasal conchae.
On which chromosome is there a mutation that leads to sickle cell anemia?
A. chromosome 3 B. chromosome 11 C. chromosome 14 D. chromosome 21
Most membranes are composed of two or three tissue types. However, an example of an exception is the ________ membrane
A) cutaneous B) mucous C) synovial D) serous E) basement