The following smooth muscle relaxants act by affecting calcium release except:
ADantrolene
BNifedipine
CPrazosin
DVerapamil
Which of the following statements is true regarding smooth muscle contraction?
ANone of the options.
BCalmodulin plays no role in smooth muscle contraction.
CPhosphorylation of myosin is essential for contraction.
DTroponin plays a significant role in smooth muscle contraction.
What is the PRIMARY mechanism by which the Na+-Ca2+ exchanger functions in cardiac muscle cells?
ANa+-Ca2+ exchanger requires ATP directly
BNa+-Ca2+ exchanger acts to remove Ca2+ from heart muscle cells
CThe Na+-Ca2+ exchanger operates in reverse mode during normal cardiac contraction
DThe Na+-Ca2+ exchanger primarily moves Ca2+ into cardiac muscle cells during systole
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