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.
Most clients I work with start seeing their cardio stamina start to increase within 10-20 days, some much sooner than that. Definitely before the end of your 1st month a gain in stamina should be very evident, and this is probably a conservative estimate.veryone is different, but for me I started out at 15 minutes at 3.5, 0 incline. I don't know exactly how long it took (many months), but I now do 4.0 at 15 incline for as much as 90 minutes bringing my calorie burn over 1000.