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 Numbers. A cholesterol test measures the amount of cholesterol in your bloodstream. Total cholesterol numbers over 240 mg/dL are considered high. While knowing your total number is helpful, it's also important to know your LDL and HDL numbers. Your ideal LDL cholesterol level may be different from someone else's based on your risk factors for heart disease.