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.
Cholesterol and Triglyceride Levels. Blood cholesterol is measured in milligrams per deciliter (mg/dL). A deciliter is one-tenth of a liter). NCEP defines a desirable total cholesterol level as less than 200 mg/dL, and levels for most women stay in the healthy or desirable range until middle-age.