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.
Total Cholesterol Levels. A normal total cholesterol level should be under 200 mg/dL. It's best to consider total cholesterol to be a good overview number, not the number that you use to decide whether or not you have an ideal cholesterol reading.In fact, total cholesterol levels can be misleading.For example, a person can have a normal total cholesterol level but have a low HDL level and high LDL level. Both low HDL levels and high LDL levels increase a person's risk for heart disease.This is why most treatment decisions are based on HDL and LDL cholesterol levels, not total cholesterol. Cholesterol-Overview.otal Cholesterol Levels. A normal total cholesterol level should be under 200 mg/dL. It's best to consider total cholesterol to be a good overview number, not the number that you use to decide whether or not you have an ideal cholesterol reading.