There are no specific times, but in general, unconsciousness will occur in 5 to 10 seconds with irreversible damage setting in as little as two and a half minutes. Past eight minutes , a person can, for medical purposes, be considered definitively dead. (There are a very small number of exceptions; e.g., Hypothermic body temperature can slow biorhythm enough to prevent damage over a longer time period.)
Keep in mind that the human brain and neural system is unpredictable and these are only general values. The above stated relates to oxygen deprivation caused by non-circulation of the blood, as your question seems to imply.
In very rare cases, even with resuscitation a person can die due to other complications. (These are usually neural complications that can cause problems with natural heart-beat regulation by the brain.) How likely this is depends on what caused the cardiac arrest.
Exceeding the speed limit is a reason to be stopped by the cops. It begins with the letter e.
The circulatory phase begins at 4 minutes and lasts through 10 minutes following the cardiac arrest.
The breeding (or rutting) season for buffalo generally begins in June. The gestation period for buffalo is about the same as for beef cattle, 287 days.
Knitting is a hobby that begins with K
Kennedy is a surname. It begins with K.
5 minutes
By beating the game
Exceeding the speed limit is a reason to be stopped by the cops. It begins with the letter e.
Edward injects Bella with venom straight into her heart to get it into her bloodstream fast as she was dying. He then begins to 'bite' her all over to get more venom into her blood before her heart stopped beating.
The heart begins beating.
15-20 minutes
Development begins before birth and ends generally ends at the age of twenty-five.
making observations and asking questions.
greater than 10 minutes
The start codon. The codon AUG is generally referred as the start codon because the translation of mRNA begins on AUG.
The circulatory phase begins at 4 minutes and lasts through 10 minutes following the cardiac arrest.
i dont know you tell me scientific process begins with Observation and investigation .