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.
The most affected organ from hypoglycemia is the brain, which requires a full glucose supply at all times. Interruption of that supply is similar to interruption of oxygen -- it causes brain insult and damage within 3-4 minutes.ince all the cells of the body, especially the brain cells, use glucose for fuel, a blood glucose level that is too low starves the cells of needed fuel, causing both physical and emotional symptoms.