What roles do myoepithelial cells perform?

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Triggering contractionProviding structural support to the end piece during saliva secretionSending signals to acinar secretory cells to organize their structureAll of the aboveNone of the above

Explanation

Myoepithelial cells are involved in multiple functions including initiating contraction, supporting the end piece during active saliva secretion, and communicating with acinar secretory cells to maintain structural organization, hence all of the listed roles apply.