Final answer:
Extracellular fluid osmolality in mammals is tightly regulated, typically around 280 to 300 mOsm/kg, ensuring a balance of water and electrolytes crucial for maintaining various bodily functions, including blood pressure.
Step-by-step explanation:
The extracellular fluid osmolality of mammals is carefully regulated to maintain proper physiological functions. A healthy body maintains plasma osmolality within a narrow range, typically around 280 to 300 mOsm/kg. This tight regulation involves both water intake and output mechanisms, ensuring the balance of electrolytes and fluids, which is crucial for various bodily processes, including blood pressure maintenance.
Mammalian systems, including the kidneys, play a vital role in this regulation by filtering blood and maintaining the proper osmotic balance. Important ions such as sodium, potassium, calcium, and chloride are closely regulated in body fluids, and deviations from the normal range of osmolality can lead to several health problems.