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.
Normal lipid panel total cholesterol is 180 to 200 milligrams per deciliter (mg/dL) or less. Between 201 and 240 mg/dL is considered borderline. This means your doctor may test you more often and suggest diet and lifestyle changes. A high reading (unhealthy) is greater than 240 mg/dL.