Historical Examples. 1  It will be seen that the valves v on the other side of the annular chamber are closed. 2  The angle of the anterior chamber is a true angle and not an annular sinus. 3  Johnston suggests that the reference is to an annular eclipse which he finds occurred on August 14, at about 8Â¼ h. in the morning.
Cellular nutrients come in many forms, including sugars and fats. In order to provide a cell with energy, these molecules have to pass across the cell membrane, which functions as a barrier â but not an impassable one.
It is a major component of cellular membranes, where its concentration varies depending on the function of the particular cell. For example, the membrane of liver cells contains fairly large fractions of cholesterol (~30%).1. The cholesterol in cell membranes serves two primary functions. First, it modulates the fluidity of membranes, allowing them to maintain their function over a wide range of temperatures.