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Definition
| A coordinated system of lenses arranged to produce an enlarged, focusable image of a specimen using light. |
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| increases its apparent size |
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| ability to distinguish two points as separate points |
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| amount of difference between the lightest and darkest parts of an image |
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| light bulb located at the base of the microscope that illuminates the specimen by passing light through a thin, almost transparent part of the specimen |
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| Located immediately below the specimen, focuses light from the light source onto the specimen. |
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Definition
| regulates the amount of light reaching the specimen |
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| a series of several lenses that magnify the image mounted on the revolving nosepiece |
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Definition
| low magnification(4X), medium magnification(10X), high magnification(40X), oil immersion(100X) |
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Definition
| metal casing through which light passes to the oculars |
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Definition
| lens you look through(10X) |
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Definition
| contains more than one lens, bends light |
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| Total magnification formula |
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Definition
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Definition
| the image will remain nearly focused after the 40X objective lens is moved into place |
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Definition
| the image will remain centered in the field of view after the 40X objective lens is in place |
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Definition
| changes the specimen-to-objective distance |
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Definition
| the area that you can see through the ocular and objective |
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Definition
| small glass disk with thin lines numbered and etched in a row |
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Definition
| a glass slide having precisely spaced lines etched at known intervals |
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Term
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Definition
| FOVlow X MAGlow=FOVhi X MAGhi |
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Term
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Definition
| diameter of the field of view of the low-power objective |
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Definition
| magnification of the low-power objective |
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Definition
| diameter of the field of view of the high-power objective |
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Definition
| magnification of the high-power objective |
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Definition
| the thickness of the object in sharp focus |
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Term
| dissecting (stereoscopic) microscope |
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Definition
| used to view objects that are opaque or too large to see with a compound microscope; larger work distance; allows to dissect and manipulate specimens; large depth of field |
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Definition
| passively moves molecules in biological systems caused by heat |
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Definition
| visible with high magnification; when particles are small enough to vibrate when other molecules bump into them |
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Definition
| when substances move through solutions and across membranes in a predictable direction |
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| depends on the presence of a gradient of concentration, heat, and pressure. Molecules diffuse from an area of high concentration, heat, and pressure to an area of low concentration, heat and pressure. |
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| determined by the steepness of the gradient, it's size, polarity or solubility. |
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| when a membrane allows some molecules to pass while retarding others |
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Definition
| positively charged areas and negatively charged areas |
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| two characteristics of molecules that govern their passive movement through a lipid membrane |
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Definition
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Definition
| no local areas of positive or negative charge |
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Definition
| the separation of dissolved substances by means of their unequal diffusion through a differentially permeable membrane |
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Definition
| is a pH indicator that runs red in basic solutions |
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Definition
| a starch indicator that turns from yellow to dark blue in the presence of starch |
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Definition
| Diffusion of water across a differentially permeable membrane |
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Definition
| homogeneous liquid mixture of two or more kinds of molecules |
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| fluid that dissolves substances |
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| substance dissolved in a solution |
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| solution of lower concentration of solutes (cell swells) |
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| solution with a high concentration of solutes (cell shrinks) |
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| equal concentrations of solutes(remains the same) |
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| graphed on horizontal axis |
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Definition
| combined effects of concentration and pressure |
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| destruction of a cell by the influx of water (causing it to burst) |
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| destruction of a red blood cell |
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| the shrinking of the cytoplasm of a plant cell in response to diffusion of water out of the cell and into hypertonic solution(high salt concentration) surrounding the cell |
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