In those cases, the spread between the bid & ask goes to the market maker as compensation for making a market in a stock. For a liquid stock that is easy for the market maker to turn around and buy/sell to somebody else, the spread is small (narrow).
In cerebral hypoxia, sometimes only the oxygen supply is interrupted. Brain cells are extremely sensitive to a lack of oxygen. Some brain cells start dying less than 5 minutes after their oxygen supply disappears. As a result, brain hypoxia can rapidly cause severe brain damage or death.
Subject: Re: Life Expectancy in Freezing Water. Answered By: siliconsamurai-ga on 16 Jan 2006 09:45 PST. Hi, thank you for bringing Google Answers your question. I'm glad you emphasized approximately and the approximate answer is that it will take about 20 minutes before hypothermia becomes irreversible.