单项选择题

在下列组织中, 紧密连接特别重要的有( )

A.Stomach(胃) and kidneys
B.Smooth muscle
C.Heart muscle
D.Intestinal epithelial tissue(肠表皮组织)
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单项选择题
钙泵的作用主要是( )。
A.降低细胞质中Ca2+的浓度;
B.提高细胞质中Ca2+的浓度;
C.降低内质网中Ca2+的浓度;
D.降低线粒体中Ca2+的浓度
单项选择题
The hormone glucagons(胰高血糖素) stimulates the breakdown of stored glycogen in liver and muscle cells by the following enzymes. Which is the first enzyme that must be activated ( )
A.Protein kinase A
B.Phosphorylase kinase
C.Glycogen phosphorylase
D.Protein phosphatase
E. Protein phosphatase inhibitor-1
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