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.
Each part of a cell completes a certain function for the cell. All cells include the following parts: 1  Cell Membrane - forms the outer boundary of the cell and allows only certain materials to move into or out of the cell.  Cytoplasm - a gel-like material inside the cell; it contains water and nutrients for the cell.