19. What is the difference between dihydropyridines and nondihydropyridines?
A. Dihydropyridines slow down calcium channels in the heart and nondihydropyridines do not
B. Dihydropyridines constrict arterioles
C. Both dihydropyridines dilate arterioles and nondihydropyridines constrict arterioles
D. Nondihydropyridines slow calcium channels in the heart and dilate arterioles
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