Extrafusal muscle fiber Extrafusal muscle fiber Extrafusal muscle fibers are the skeletal standard muscle fibers that are innervated by alpha motor neurons and generate tension by contracting, thereby allowing for skeletal movement. They make up the large mass of skeletal muscle tissue and are attached to bone by fibrous tissue extensions (tendons). Each alpha motor neuron and the extrafusal muscle fibers innervated by it make up a motor unit. The connection between the alpha motor neuron and the extrafusal muscle fiber is a neuromuscular junction, where the neuron's signal, the action potential, is transduced to the muscle fiber by the neurotransmitter acetylcholine. Extrafusal
It Takes a Muscle It Takes a Muscle "It Takes a Muscle" is a song by British recording artist M.I.A. from her third studio album, "Maya" (2010). It is a cover of the song "It Takes a Muscle [To Fall in Love]" by Dutch project Spectral Display and was written by the act's members Michael Mulders and Henri Overduin. It was originally released in 1982 as a single from their debut album "Spectral Display". Production of M.I.A.'s version was handled by Diplo and incorporated reggae elements. The single was released worldwide as a digital download, under license to XL Recordings and N.E.E.T. Recordings, on