http://www.wisegeek.org/what-are-transducers.htm
Eyes, Ears, Nose, Tongue, Touch are the external equivalent physical components.
Bones would be an internal equivalent used as an antenna metaphor.
…”input transducers take some sort of physical energy — such as sound waves, temperature, or pressure “…
Triple Heater is the internal transducer, but the primary resides with the Thyroid Gland.
The interesting thing here, is that there are multiple types of transducers… extremely fun concepts to play with here. Bet you now I can come up with many other types and uses than those listed below using just Pearls as the standard model to activate the other ones and go on fishing expeditions to see what comes up.
This is gonna be fun !
Ultrasound Transducers
Voltage Transducers
Linear Transducers
Piezo Transducer
Frequency Transducers
Diaphragm and any other types of thin membrane can be considered as basically a Speaker.
Live~NRGY 
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