THE PEOPLE WHO FIRST INVESTIGATED CELLS. Zacharias Janssen: 1590 Dutchman; maker of reading glasses...
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Transcript of THE PEOPLE WHO FIRST INVESTIGATED CELLS. Zacharias Janssen: 1590 Dutchman; maker of reading glasses...
![Page 1: THE PEOPLE WHO FIRST INVESTIGATED CELLS. Zacharias Janssen: 1590 Dutchman; maker of reading glasses Put 2 magnifying glasses in a tube. (1st crude compound.](https://reader036.fdocuments.in/reader036/viewer/2022081506/5697c0051a28abf838cc51db/html5/thumbnails/1.jpg)
THE PEOPLE WHO FIRST INVESTIGATED CELLS
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Zacharias Janssen:Zacharias Janssen:
• 1590• Dutchman; maker of reading
glasses• Put 2 magnifying glasses in a
tube. (1st crude compound microscope)
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Anton Van Anton Van Leewenhoek:Leewenhoek:• Mid-1600’s• Dutch scientist• Saw organisms
in pond water by making a simple microscope with a tiny glass bead for a lens
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Anton Van Anton Van Leewenhoek:Leewenhoek:
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Robert Hooke:Robert Hooke:
• 1665• English scientist• Saw cork slices under the
microscope• Named the “little boxes” he saw
“cells”
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Matthias Schleiden:Matthias Schleiden:
• 1838• German Scientist• Studied plant parts with
microscope• Said all plants were made of cells
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Theodor Schwann:Theodor Schwann:
• 1839• German Scientist• Deduced that all animals were
made up of cells
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What was “Spontaneous What was “Spontaneous Generation”?Generation”?
• People thought that life could be created “spontaneouslyspontaneously”
• They even had “recipesrecipes” for certain living things:
To create mice, a recipe called for dirty underwear and wheat grain to be mixed in a bucket and left open outside. In 21 days or less, you would have mice. The real cause may seem obvious from a modern perspective, but to the proponents of this idea, the mice spontaneously arose from the wheat kernels.
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Rudolph Virchow:Rudolph Virchow:
• ~1855• German Doctor• Deduced that all cells come from
other cells
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Cell TheoryCell TheoryWhat we now believe to be true
about cellsThere are three parts:1) All organisms are made up of one
or more cells2) Cells are the basic units of
structure & function in all organisms
3) All cells come from cells that already exist
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Characteristics of Characteristics of Living ThingsLiving Things
Traits something must have in order to be considered alive.
Characteristics of Life Video Clip
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Characteristics of Characteristics of Living ThingsLiving Things
Traits something must have in order to be considered alive. 1) Reproduces
2) Grows & develops3) Sensitivity – responds to outside world4) Uses energy - eats food or makes food5 ) Can move in some way6) Breathes/exchanges gas7) Excretes – gets rid of wastes