Physiology is the branch of biology that deals with the functions of living organisms and the parts of which they are made. This scientific discipline covers a wide variety of functions, ranging from the cellular and below to the interaction of organ systems that keep the most complex biological machines running.
PTSD redirects here. For the album by Pharoahe Monch, see PTSD (album). Posttraumatic stress disorder (PTSD) is a mental disorder that can develop after a person is exposed to a traumatic event, such as sexual assault, warfare, traffic collisions, or other threats on a person's life.
Trauma- and Stressor-Related Disorders. Post Traumatic Stress Disorder (PTSD) is characterized by symptoms that include intense fear, helplessness, and/or horror that a person experiences following an exposure to a traumatic event. The traumatic event can include an actual or threatened death or a threat to oneâs or another personâs physical integrity.