Free radicals and antioxidants in normal physiological functions and human disease. (greensfirst.com)
Proper electrolyte balance is achieved by maintaining a relatively high potassium content inside the cell and a high sodium concentration in the fluid outside the cell (extracellular fluid): Though potassium and sodium are the two major electrolytes found in the human body, many other elements are required for normal physiological function. (ericbakker.com)
The masks prevent hypoxia, when the body lacks enough oxygen to maintain normal physiological function. (cnbc.com)