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Chapter 1 Section 4 Holt Life Science

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Term
Definition
SI   International System of Units  
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area   is measured in square units  
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liter   metric unit for meausuring liquid.  
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area   the amount of surface something has.  
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compound light microscope   consists of a tube with lenses, a stage and a light source, often used in classrooms  
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electron microscope   tiny particles of matter are used to magnify image  
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transmission electron microscope   electrons pass through the specimen and produce a flat image, magnifies up to 200,000 times the actual size.  
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scanning electron microscope   electrons bounce off the surface of the specimen and produce a 3D image, magnifies up to 100,000 times actual size  
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x-rays   used for almost a century (100 years)to see internal structures of organisms (bones, heart, lungs) and the stuctures of proteins  
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CT scans (computerized tomography)   low dosage x-ray beams are passed through the body at different angles, and often a dye is injected to help highlight tissues- provides a clearer, more detailed image than x-rays useful for studying brain and spinal tissue.  
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CT scans   computerized tomography  
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MRI   magnetic resonance imaging  
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MRI   provides a clearer image than x-rays by using short bursts of magnetic field, useful for studying brain and spinal tissue  
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CT, MRI, SEM and TEM   data and images are transferred to a computer to create the image  
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computer   used to collect, store organize and analyze information, can create graphs, solve math problems and analyze data  
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graduated cylinder   measures the volume of liquids and irregular shaped solids, basic unit is liter, can be converted to cubic centimeters  
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thermometer   measures temperature (how hot or cold an object is) basic unit is degree  
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balance scale or triple beam balance   measures the mass of an object,basic unit is kilogram  
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meter stick   measures the length of objects, basic unit is meter  
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benefit of using metric system   easier to compute, base 10, more accurate, less errors.  
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benefit of using metric system   shared by all scientists worldwide  
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volume   the amount of space an object occupies (takes up)  
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