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.
1) Total Cholesterol: less than 200 mg/dL. 2) LDL: 100 mg/dL to 129 mg/dL. 3) HDL: more than 40 mg/dL. 4) Triglycerides: 100 mg/dL to 150 mg/dL. It should be taken into account that the mentioned normal ranges are rather unstable, because they are changing with age.If the normal level of LDL of a 25-year-old is 160 mg/dL, for a 75-year-old it would be too small.) Total Cholesterol: less than 200 mg/dL. 2) LDL: 100 mg/dL to 129 mg/dL. 3) HDL: more than 40 mg/dL. 4) Triglycerides: 100 mg/dL to 150 mg/dL. It should be taken into account that the mentioned normal ranges are rather unstable, because they are changing with age.