yes
They are transmitted by the release of acetylcholine into the neuromuscular junction.
Yes, muscles are made up of muscle fibers. If you want to know more about muscles go to this site: http://kidshealth.org/teen/your_body/body_basics/bones_muscles_joints.html#
i think it is lack mitochondria.... but it could also be lack a plasma membrane and have many nuclei.
the area of contact between the axon terminal of a motor neuron and a portion of the sarcolemma of a muscle fiber.