An accurate test for how long does nicotine stay in your system can be performed via blood test. If a laboratory is testing for nicotine, it should be performed within 3 days of smoking. It is better for a laboratory to test for cotinine as it remains in the blood stream for about 10 days after smoking.
The pH in the human digestive tract varies greatly (see Human Digestive Tract pH Range Chart on the left side). The pH of saliva is usually between 6.5 - 7.5. After we chew and swallow food it then enters the fundic or upper portion of the stomach which has a pH between 4.0 - 6.5.he pH of any solution is the measure of its hydrogen-ion concentration. The higher the pH reading, the more alkaline and oxygen rich the fluid is. The lower the pH reading, the more acidic and oxygen deprived the fluid is. The pH range is from 0 to 14, with 7.0 being neutral.
Humans are homeotherms like most mammals. This means that we are warm blooded animals and have to regulate our internal body temperature. The ideal temperature range for a human body is 37Â°C. If there is even a 5Â°C drop or rise in body temperature, it could spell doom for the human being.s you can see, the temperature range within which a human can survive is very narrow. This makes one wonder what regulates body temperature in humans. This is especially quite intriguing as the external environmental temperature ranges are totally different from the internal body temperature.