The signal transduction pathway is the mechanism by which the energy of a photon signals a mechanism in the cell that leads to its electrical polarization. 1  This polarization ultimately leads to either the transmittance or inhibition of a neural signal that will be fed to the brain via the optic nerve.
The Inland Empire (I.E.) is a metropolitan area and region of Southern California. It is situated directly east of the Los Angeles metropolitan area.
The Inca Empire covered 3,000 miles of the western coast of South America. The. Inca Empire included parts of the present day countries of Peru, Ecuador, Bolivia, Argentina, and Chile. The Inca civilization was very advanced.