Something transmitted is passed or sent from one place to another. Transmitted messages or signals, for example, might be sent by one person and received by another.
Start with trans-, which shows up in many words having to do with travel or movement. Something that's transmitted travels from one point to another. A transmitted message might be sent via smoke signal, and transmitted information about your whereabouts can be conveyed through your cellphone. Your blue eyes are evidence of transmitted genetic material. Transmitted, though, is best used for things you can't hold or touch. For those, use transported.