* Blood: The pH of human blood must be maintained within a very tight range of 7.35 to 7.45. This is slightly alkaline. Even small deviations outside this range can be life-threatening.

* Other bodily fluids: Other bodily fluids also have specific pH ranges that are essential for proper function. For example, stomach acid has a pH of about 2, which is highly acidic, and is necessary for digestion.

While the blood pH must remain within a very narrow range, the overall pH of the human body can vary slightly. For example, urine pH can range from 4.5 to 8.0 depending on diet and other factors.

It's important to note that:

* Acidosis and Alkalosis: Conditions where the blood pH deviates significantly from the normal range are called acidosis (too acidic) and alkalosis (too alkaline). These conditions can be caused by various factors and can be life-threatening if not addressed.

* Homeostasis: The human body has complex mechanisms to regulate its pH balance and maintain homeostasis. These mechanisms involve the lungs, kidneys, and various buffer systems.

In summary: The human body has a very specific pH range that is essential for survival. Even small deviations from this range can be dangerous. Maintaining a healthy pH balance is crucial for overall health.