Cell Size and Shape - available in the zygote cells. Later...

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Cell Size and Shape The shapes of cells are quite varied with some, such as neurons , being longer than they are wide and others, such as parenchyma (a common type of plant cell) and erythrocytes (red blood cells) being equidimensional. Some cells are encased in a rigid wall, which constrains their shape, while others have a flexible cell membrane (and no rigid cell wall). The size of cells is also related to their functions. Eggs (or to use the latin word, ova ) are very large, often being the largest cells an organism produces. The large size of many eggs is related to the process of development that occurs after the egg is fertilized, when the contents of the egg (now termed a zygote ) are used in a rapid series of cellular divisions, each requiring tremendous amounts of energy that is
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Unformatted text preview: available in the zygote cells. Later in life the energy must be acquired, but at first a sort of inheritance/trust fund of energy is used. Cells range in size from small bacteria to large, unfertilized eggs laid by birds and dinosaurs. The realtive size ranges of biological things is shown in Figure 1. In science we use the metric system for measuring. Here are some measurements and convesrions that will aid your understanding of biology. 1 meter = 100 cm = 1,000 mm = 1,000,000 µm = 1,000,000,000 nm 1 centimenter (cm) = 1/100 meter = 10 mm 1 millimeter (mm) = 1/1000 meter = 1/10 cm 1 micrometer ( µ m) = 1/1,000,000 meter = 1/10,000 cm 1 nanometer (nm) = 1/1,000,000,000 meter = 1/10,000,000 cm...
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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