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.
post traumatic stress disorder ptsd is a condition that arises when a person is subjected to an overwhelming experience of trauma ptsd is characterized by the person s response to the trauma including avoiding similar situations and having persistent thoughts and memories related to the trauma ptsd also causes sufferers to experience both long and short term memory loss