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.
Your cholesterol level is considered high if you have total cholesterol levels of 240 mg/dL or higher. It's considered borderline when it's between 200 and 239 mg/dL. Total cholesterol levels below 200 mg/dL are considered ideal, but your individual target cholesterol level may be different, as determined by your doctor and depending on your risk factors for heart disease. Cholesterol Facts. Nearly half of all American women have high or borderline high cholesterol.