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Fainting
Fainting is when you lose consciousness for a short time because your brain is not getting enough oxygen. The medical term for fainting is syncope, but it is commonly known as “passing out.” A fainting spell generally lasts from a few seconds to a few minutes. A brief feeling of lightheadedness, dizziness, weakness, or nausea sometimes precedes...
Source: healthline.com

thesymbiont.blogspot.com/2011/07/fainting-and-evolution.html

Jul 4, 2011 ... As someone who cares about her well being and someone who's interested in evolution I'm left wondering why the hell this's happened. ... Fainting. Psychosomatic Causes. Fear; Pain; Shock; The sight of blood and guts (fear?) Methodology. The vagas nerve increases blood flow to the intestines and ...

scienceblogs.com/effectmeasure/2008/05/07/fainting-after-a-vaccination

May 7, 2008 ... Usually the person is sitting up or standing and upon falling in a faint the recumbent position restores blood flow to the brain and they revive. There seems to be some variation in what happens when the vagus nerve is fired in the brainstem. For some people the main effect is to slow the heart rate, for others ...

www.hindawi.com/journals/bn/2014/471340

Apr 9, 2014 ... BII phobia is a condition in which people are likely to faint at the sight of blood, the anticipation of physical injury, or the anticipation of an injection, characterized by avoidance behavior and intense, irrational fear in ..... (Factor: 0.627)(10)Do you generally feel that heart rate is increased in phobic situations?

www.nhs.uk/conditions/fainting/treatments

Physical counterpressure manoeuvres are movements designed to raise your blood pressure and prevent you losing consciousness. One study found training in physical counterpressure manoeuvres can reduce fainting in some people. Physical ...

www.health.vic.gov.au/edfactsheets/downloads/fainting-and-collapse.pdf

Heat, emotional distress or pain can cause a faint. Other triggers include standing for a long time, the sight of blood or an alarming event. People who faint are often young and otherwise healthy. Another type of collapse is postural hypotension. This can happen when you stand up quickly, particularly if you have been sitting  ...

www.sciencedaily.com/releases/2012/08/120806161727.htm

Aug 6, 2012 ... Fainting has a strong genetic predisposition, according to new research. Fainting, also called vasovagal syncope, is a brief loss of consciousness when your body reacts to certain triggers, such as emotional distress or the sight of blood.

www.sussex.ac.uk/broadcast/read/838

Sep 10, 2009 ... Researcher Dr Felix Beacher, who is based at the Trafford Centre on the University of Sussex campus, says: "Fainting, which affects up to thirty five per cent of people at least once in their lives, involves an interaction between the mind (as in fainting at the sight of blood), the brain, which regulates blood flow ...

www.belmarrahealth.com/vasovagal-syncope-common-cause-of-fainting-prevented-by-sniffing-and-gasping

Oct 19, 2015 ... Vasovagal syncope is a common cause of fainting, and now there is evidence that suggests simply sniffing and gasping can help people avoid the ... Here are a few tips: avoid standing for long periods of time, do not look when blood is being drawn, avoid saunas or lying on a hot beach, and do not ...

www.theodysseyonline.com/why-are-people-squeamish

Mar 28, 2016 ... But why do these “gross” concepts easily ruin one's appetite? ... It is typical for animals to be shocked at the sight of wounds and abnormalities. ... The vagus nerve receives these signals through the carotid artery and can cause the body to gag, send blood to important organs, and even make the victim faint ...