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.
In fact, the brain requires a constant supply of glucose and oxygen. However, if you have a chronic lung disease such as emphysema, pulmonary fibrosis or COPD, having enough blood oxygen can be challenging. Lack of oxygen to the brain can cause brain damage in minutes. When the brain does not receive enough oxygen, cerebral hypoxia can occur. Hereâs what you need to know to help you better understand the risks of low oxygen and brain damage.