Michael is answering a series of questions dealing with skeletal muscle cell excitation and contraction. In response to “What protein changes shape when Ca 2+ binds to it?” he writes “tropomyosin.”...

Michael is answering a series of questions dealing with skeletal muscle cell excitation and contraction. In response to “What protein changes shape when Ca²⁺
binds to it?” he writes “tropomyosin.” What should he have responded and what is the result of that calcium ion binding?