What pH must organisms maintain?

Answer 1

Because some life forms can only survive within certain pH ranges. If the pH of their environment were to shift greatly, they would either perish, or be forced to move to a new area that isn't so hostile.

Answer 2

All living creatures, even single-celled organisms, must maintain very stable internal conditions in order to survive. Even as the metabolic environment changes, an organism must sustain physiological conditions such as temperature, pH, water content, and food intake at healthy levels. This stable level of metabolic conditions is called homeostasis, and organisms maintain homeostasis in a variety of ways. In multicellular organisms, complex buffer systems allow the organism to maintain internal pH, avoiding excessive acidity or excessive alkalinity.

Answer 3

The body has a wide array of mechanisms to maintain homeostasis (or balance) in the blood and extracellular fluid. The most important way that the pH of the blood is kept relatively constant is by buffers dissolved in the blood. Other organs help enhance the homeostatic function of the buffers. Kidneys and lungs also play important roles as well.

Answer 4

It varies depending on the animal, but generally between 5 and 9.

Answer 5

It depends on the organism. Most likely 6.5-7.5

Answer 6

The optimal livable pH range for most organisms, including humans, is 7.4 with a tolerance of no more than plus or minus .3