The Brainliest Answer!
Sacromer: It is the contractile unit of a striated muscle of the myofibril(thread like structures commposed of actomyosin being with muscle cells).

Synapse: It is the connection between the end of the one neuron to the dendrites of other neuron such that the information is passed and taken by nerve impulses.

Microvilli: Its main function is to increase the surface area of absorption to accomodate more nutrients etc
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