How does the heart beat out its regular rhythm for decades? How do our eyes process the light and color before them? Ion channels control or regulate diverse physiological activities in our body.

Take the electrolyte potassium, for example. It is the most abundant positively charged ion inside cells, but its concentration is 30-fold lower in the extracellular environment. "Suddenly an ...

Water levels and mineral ions in the blood are controlled ... On the other hand, if the water concentration is too low outside compared to the inside of the cells, water will leave by osmosis ...