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Science Chapter 1 Section 4

compound light microscope Consists of a tube with lenses, a stage, and a light source- it magnifies the image, common in science classrooms. Range of magnification @ 40x -400x. Review parts and functions.
electron microscope Tiny particles of matter are used to magnify images. NEVER LIVE SPECIMENS
transmission electron microscope (TEM) Electrons pass through the specimen and produce a flat image-can magnify up to 200,000 times the actual size. (No live specimens)
scanning electron microscope (SEM) Electrons bounce off the surface of the specimen and a three-dimensional (3-D) image is produced-can magnify up to 100,000 times the actual size. (No live specimens)
X-rays Used for almost a century to see internal structures of organisms (bones, heart, lungs) and the structures of proteins (DNA).
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. Fast results less expensive.
MRI(magnetic resonance imaging) Provides a clearer image than x-rays by using short bursts of magnetic field -useful for studying brain and spinal tissue. Takes 25-60 minutes to get results. Uses a computer to display
Computers Can collect, store, organize, and analyze information-can create graphs, solve math problems, and analyze data. With the help computers, life scientists are able to solve problems that they were not able to solve in the past.
Be sure to review your class notes.
Created by: tziccardi