One of the characteristic features of a living cell is that it controls the exchange of electrically charged ions across the cell membrane and therefore the electrical potential of its interior relative to the exterior. This Scholarpedia page is a basic introduction into the mechanisms underlying this process.
Here are the ranges for total cholesterol in adults: 1  Normal: Less than 200 mg/dL. 2  Borderline high: 200 to 239 mg/dL. 3  High: At or above 240 mg/dL.
âA total cholesterol level of less than 200 mg/dL (5.17 mmol/L) is normal. âA total cholesterol level of 200 to 239 mg/dL (5.17 to 6.18 mmol/L) is borderline high. âA total cholesterol level greater than or equal to 240 mg/dL (6.21 mmol/L) is high. The total cholesterol level can be measured any time of day. It is not necessary to fast (avoid eating for 12 hours) before testing.