单项选择题

Circulating antibodies are synthesized and secreted by which of the following cells

A．T memory cells
B．B memory cells
C．T helper cells
D．Plasma cells
E．T cytotoxic cells
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单项选择题
Which of the following statements concerning liver sinusoids is TRUE
A． They are continuous with bile canaliculi
B．They are surrounded by a well developed basal lamina
C．They are lined by nonfenestrated endothelial cells
D．They deliver blood to the central vein
E．They deliver blood to portal vein
单项选择题
Which of the following statements concerning the pancreas is FALSE
A． It possesses islets of Langerhans
B．It possess serous demilunes
C．It contains more beta cells than alpha cells
D．It exhibits large, electron-lucent granules in its S cells.
E．Its acinar cells contain a round nucleus
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