Fainting ( syncope ) is a person and loss of consciousness suddenly , due to a lack of oxygen flowing to the brain cells
In the brain we have the part .
Cerebellum , and the cerebrum . The brain is in desperate need of blood flow from the heart keotak that mtersedianya oxygen glucose also all brain cells .

In order for our bodies stay aware , there is a place that we know as the reticular activating system in the brain stem that is to be kept alive , and at least one part of our brain to function .

Fainting occurs when the reticular activating system or both halves of our brains lack of blood flow , oxygen , .

1 . The reaction of the vagus nerve
Fainting mostly due to the vagus nerve that connects the brain to the digestive system and to actively manage blood Kesel - channel brain cells and other organs . Slowing of heart rate lowering blood pressure , blood supply to the brain causes fainting .

2 . Changes in blood pressure
Changes in blood pressure can cause fainting . sometimes , blood vessels and the heart does not work fast enough when both organs need oxygen stretcher . like this is very common in many elderly people and people who 've health conditions less than the maximum . Fainting may come a moment too long standing or activity not push yourself
3 . anemia
Anemia ( deficiency of red blood cell count ) may be the cause of fainting because not enough red blood cells transports oxygen to the brain cells Kesel .
4 . dehydration
Lack of fluid in the body ( dehydration ) also bida be the cause fainting . Dehydration is a lack of fluid in the body due to excessive sweating , lack of drinking water diarrhea ( diarrhea-diarrhea )
5 . shock
Shock is a condition that we can see the low blood supply which in turn mengilangan consciousness . sometimes shock patients were found baffled , before pingsang or loss of consciousness when conditions are less well

How to deal with people pingasan
move the victim to the place that is cool / cool , then loosen the clothing in use , continue to elevate the lower leg portion is approximately 30 cm high . uasahakan surrounded the victim can not breathe fresh air , do not be fragrant ( eucalyptus oil , etc. ) and note the condition of the victim , if he is suffering from other diseases do not langdung given a drink , because the heart and lungs work just to send oxygen Kesel - Otan cells refer kepasilitas health / hospital nearby