During muscular contraction, cross-bridges form between ________ and ________ .
A. myosin; tropomyosin
B. troponin; calmodulin
C. myosin; troponin
D. actin; myosin
E. actin; tropomyosin
Answer: D
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Indicate whether the statement is true or false.
Which function of cellular membranes is critical to the ionic and molecular organization of cells?
a. the controlled transport of ions and molecules across the membrane
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