10. Cell Signaling
Introduction to Cell Signaling
Multiple Choice
Multiple ChoiceCells of the gastrointestinal (GI) tract and cells of the heart respond differently to epinephrine because __________.
A
the GI tract does not have receptor tyrosine kinases
B
in cells of the GI tract epinephrine operates via a cytosolic receptor, whereas in cells of the heart epinephrine acts via a plasma membrane receptor
C
the concentration of Ca2+ is lower in the cytosol of GI-tract cells than in the cytosol of heart cells
D
cells of the GI tract lack ATP
E
there are differences in the proteins found in the two types of cells
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