Cells: The Basic Units of Life - Vocabulary Flashcards

Flashcards for reviewing key vocabulary from the lecture notes on cells, microscopes, and magnification.

Tissue

A group of similar cells with a common function.

Organ

A group of different tissues performing a common function.

System

Different organs performing a common function.

Macroscopic View

Describing, drawing, and labeling the external view of a plant or animal, looking at organs and structures large and visible to the naked eye.

Robert Hooke

English scientist who in 1665 looked at cork tissue under a simple microscope and saw many box-like 'compartments' in cork tissue and called them 'cells'.

Anton van Leeuwenhoek

Observed and described single-celled organisms (bacteria) using a microscope.

Cell Theory

States that every living organism is made up of cells; cells are the basic units of structure and function in living organisms; and every cell comes from another cell.

Light Microscope

Microscope that can magnify objects up to 400 to 1500 times.

Electron Microscope

Microscope invented by Zworykin in the 1930s that allows for finer details of cell structures to be visible.

Scanning Electron Microscope (SEM)

Used to scan and view the surface of objects.

Transmission Electron Microscope (TEM)

Enables us to see inside objects by transmitting light through them.

Base (Microscope Part)

Supports the microscope.

Mirror/Illuminator/Lamp (Microscope Part)

Provides a source of light.

Condenser (Microscope Part)

Concentrates light through the slide and specimen.

Iris Diaphragm (Microscope Part)

Regulates the amount of light entering the microscope.

Stage (Microscope Part)

Platform on which the slide is placed for examination.

Objectives (Microscope Part)

Lenses used to magnify the image of the specimen.

Revolving Nosepiece (Microscope Part)

Attachment for objectives; rotated to select the objective.

Body Tube (Microscope Part)

Supports and links optical parts like eyepiece and objectives.

Coarse Adjustment Knob (Microscope Part)

Moves body tube rapidly up or down to focus the image; used mostly at low magnifications.

Fine Adjustment Knob (Microscope Part)

Used to finely focus the image to get a sharp picture; used with higher magnification objectives.

Eyepiece/Ocular (Microscope Part)

Combination of lenses to magnify image from objectives and specimen.

Magnification Power of Microscope

Magnification of eyepiece x magnification of objective lens.

Field of View

Circle of light seen when looking through the eyepiece.

Micrometer (Micron)

Unit of measurement, symbol μm

Magnification of Drawing

Drawing size / Object size.