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.
Example 1: Cholesterol levels of adult males (50-60 yrs. old). The mean blood cholesterol level of adult males (50-60 yrs. old) is 200 mg/dl with a standard deviation of 30 mg/dl. Assume also that blood cholesterol levels are approximately normally distributed in this population.holesterol levels of adult males (50-60 yrs. old). The mean blood cholesterol level of adult males (50-60 yrs. old) is 200 mg/dl with a standard deviation of 30 mg/dl. Assume also that blood cholesterol levels are approximately normally distributed in this population.