单项选择题

A．They communicate with each other via haversian canals……

Which one of the following statements regarding osteocytes is FALSE

A．They communicate with each other via haversian canals
B．They live for a long time
C．They possess long cytoplasmic processes
D．They are housed in their own lacunae
E．Osteocytes communicate with each other via narrow cytoplasmic processes that extend through canaliculi.

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单项选择题Which one of the following statements about epithelia is FALSE

A．They are polarized
B．They are vascular
C．They are separated from underlying connective tissue by a basal lamina
D．They contain only a small amount of intercellular substance
E．They line the lumen of blood vessels

单项选择题Which one of the following cells arises from monocytes

A．Plasma cell
B．Fibroblasts
C．Lymphocytes
D．Macrophages
E．Mast cell

单项选择题Which of the following statements concerning mature skeletal muscle is FALSE

A．The cells are multinucleated
B．A sarcomere is the region between two successive Z disks
C．The nuclei are centrally located
D．Myofidrils display a characteristic crossbanding pattern
E．Actin, myosin, troponin, and tropomyosin are present