Introduction to Cells and Microscopes Flashcards
Science
What are cells?
Cells form the parts of any living organism and carry out all of its functions.
Cells are the basic units of structure and function in all living things/organisms.
Cells obtain oxygen, food, and water.
Cells also get rid of wastes, such as carbon dioxide.
The food you eat provides your cells with energy. They work together and help you to stay alive.
What does an organism refer to?
Something that is living
When were living organisms classified?
Until the 1500s
What did the invention of the microscope open up?
A whole new world-the microworld
Robert Hooke (1665)
Viewed dead cork (from a tree) under the microscope and called what he saw “cells” because they looked like little rooms.
Anton Von Lewerhook (mid-1600s)
Designed the first microscope and viewed pond water; he called the microorganisms “beasties” or “animalcules” (today bacteria and protists).
Matthias Schleiden (1830s)
Concluded after looking at plants that “all plants are made of cells.”
Theodor Shwann
Concluded after looking at all animal tissues that “all animals are made of cells.”
Rudolf Virchow
concluded that all cells come from other cells
The Cell Theory
All the scientists contributed to the cell theory.
The Cell Theory has three main parts:
All organisms are made up of one or more cells.
The cell is the basic unit of structure and function in all living organisms.
All cells come from cells.
Simple Microscope
Has one lens
Example: magnifying lens, glasses
Compound-Light Microscope
Has more than one lens – lenses are located in the eyepiece and revolving nosepiece/objective lenses
Uses light as a source
Produces a two-dimensional image
Magnification
The change in apparent size of the object
Total Magnification
The powers of the eyepiece times the powers of the objective lenses
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