Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
<span>The nervous system is the organized structure of nerve endings and cells called neurons. It runs throughout the body, and it's why we feel and respond to our circumstances, environment and life events the way we do. Anatomists classify the system structurally. It is organized and labeled as a bodily whole divided into two classified systems, one at the center of the system and the other making up its peripheral edges.</span>
