Muscle types do differ in their anatomies; we’ve learned only about the most common types. Mark each of the following A if they’d always co-occur; Sif they’d sometimes co-occur, or Nif they’d never co-occur in the same muscle type. (Hint: Base your answers on if one of the items is functional in the absence of the other.)
A. t-tubules and sarcoplasmic reticulum
B. motor units and troponin
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