CHAPTER 1: CELLS AND TISSUES
The cell is the basic unit of life. Microorganisms such as bacteria, yeast, and amoebae exist as single cells. By contrast, the adult human is made up of about 30 trillion cells (1 trillion = 1012) which are mostly organized into collectives called tissues. Cells are, with a few notable exceptions, small (Fig. 1.1) with lengths measured in micrometers (μm, where 1000 μm = 1 mm) and their discovery stemmed from the conviction of a small group of seventeenth-century microscope makers that a new and undiscovered world lay beyond the limits of the human eye. These pioneers set in motion a science and an industry that continues to the present day.
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Wed Mar 28, 2012 6:22 pm
