SENSORY ORGANS ANATOMY. 1  Sensory organs are very highly developed and specialized organs that are an extension of the central nervous system, with a sole function to take in information and relate it to the brain. The sensory neurons are highly adapted to detect changes of both external and internal changes in the environment and report these changes to the brain.
If you break a mercury thermometer or light bulb, a small amount of liquid mercury may spill out. Liquid mercury can separate into small beads, which can roll some distance away. The mercury may also evaporate into vapour. However, this small amount of mercury is extremely unlikely to cause problems for your health.
As electrons and charged atoms move through the tube they will collide with the mercury gas atoms. The collisions excite the atoms so electrons increase in energy levels. When the electrons calm down and return to their original energy level they release light photons. These photons are ultraviolet but are made into visible light when they hit the phosphor coating of the tube.