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.
Identify Healthy Cholesterol Levels. According to the American Heart Association a healthy total cholesterol level is less then 200 mg/dl. You are considered to have borderline high cholesterol if your level is between 200 to 239 mg/dl. You will be diagnosed with high cholesterol if your level is is 240 mg/dl and over.