A relatively recent discovery has been that new neurons can…

A relatively recent discovery has been that new neurons can be generated in certain brain regions (particularly the dentate gyrus of the hippocampus) in adult animals, including humans.  This is is contrast to the previous belief that no neurons were produced after birth in most species. 

The automatic nervous system has two branches: the sympathet…

The automatic nervous system has two branches: the sympathetic division, which controls fight/flight response and plays a prominent role in the physical symptoms of anxiety like heart racing, and the parasympathetic nervous system which mediates functions the body performs in times of calm, like digesting food.