Sensory detection based on electrical impulses

Came across this (see link) and thought it relevant to more understanding on how energy in some form is everything.

"Yes, sensory detection really is based on electrical impulses. In essence, a stimulus (be it light photons, molecules in food or whatever) causes a conformational change in a receptor protein, either directly or indirectly. This change in structure starts off a cascade of signalling molecules inside the cell that eventually lead to changes in the relative concentrations of potassium and sodium ions inside and outside the nerve cell. As potassium and sodium have an electrical charge, this causes a change in the electrical potential of the cell, hence it is described as an electrical signal. Hopefully that makes some sense".