Definition of laggard in US English - a person who makes slow progress and falls behind others Definition of laggard in US English - a person who makes slow progress and falls behind others dictionary
Unconsciousness occurs within about 30 seconds, so it's not as if you would have very much time to contemplate what is happening. Once the brain goes unconscious, tissue begins to die after about 5 minutes of oxygen starvation. After this point, there may only be small islands of activity remaining in various brain structures. After ten to fifteen minutes, complete brain death will usually occur. One exception to this is if the brain (and body) are in a state of hypothermia. Extreme cold can induce a process called neuroprotection; metabolism is greatly reduced, and the brain can survive for much longer than it would at room temperature.
There is very little research on just how long the body of a brain-dead person can be maintained. The discussion of brain death dates back to the 1950s in France with six patients who were kept alive for between two and 26 days without blood flow to the brain. This generated the idea that perhaps there's a second way to die, because these patients will eventually die, Greene-Chandos said.