★ Cell and Muscle Histology Quiz
In smooth muscle, calcium released by the smooth ER initiates contraction by binding to what protein?
A. Actin
B. Calmodulin
C. Desmin
D. Myosin light chain kinase
E. Tropomyosin
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All of these are thin filaments except for:
A. Myosin
B. Actin
C. Tropomyosin
D. Troponin
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