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.
What Are Good Levels for the HDL Cholesterol? A cholesterol test or lipid panel tells the level of HDL cholesterol. What do the numbers mean? HDL cholesterol levels greater than 60 milligrams per deciliter (mg/dL) are high. That's good. HDL cholesterol levels less than 40 mg/dL are low. That's not so good. In general, people with high HDL are at lower risk for heart disease. People with low HDL are at higher risk. What Can I Do if my HDL Cholesterol Level Is Low? If your HDL is low, you can take several steps to boost your HDL level and reduce your heart disease risk: Exercise.