MICROSCOPES and CELL THEORY
MICROSCOPE HISTORY and CELL THEORY
LEVELS OF ORGANIZATION
SURFACE AREA to VOLUME RATIO
In order for cells to remain healthy, they must be able to efficiently move materials into and out of the cell across the cell membrane. The cell membrane makes up the surface area of the cell, while the volume is made up of everything within the cell membrane. If a cell becomes too big, the DNA in the nucleus can't keep up the demands of the cell. Also, a big cell makes a lot more waste. Materials have further to travel within the cell. The nutrients cannot get into the cell and waste cannot get out (think of a traffic jam going to the Cape on a Friday afternoon in the summer or going home on a Sunday afternoon!). Before a cell gets too big, it divides---that's how we grow! The surface area-to-volume ratio represents how much surface area has with respect to its volume. A cell with a higher ratio of surface area to its volume (e.g., 6:1) is better than a cell with less surface area and more volume (e.g., 3:1).