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3.1 Discovering Cells

3.1 Discovering Cells. 7.1 All living organisms are composed of cells, from just one to many trillions, whose details usually are visible only through a microscope. An Overview of Cells. Key concept: Cells are the basic units of structure and function in living things.

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3.1 Discovering Cells

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  1. 3.1 Discovering Cells 7.1 All living organisms are composed of cells, from just one to many trillions, whose details usually are visible only through a microscope

  2. An Overview of Cells • Key concept: Cells are the basic units of structure and function in living things. • Examples of function: obtaining oxygen, getting rid of waste, obtaining food, growing, and more… • Cells function similarly in all organisms, they carry out the basic processes of life similarly • Cells are so small they are measured in micrometers • One square centimeter of Skin is more than 100,000 cells • Cells are visible only through microscope

  3. First Observations of Cells • 1590ish invention of the microscope • Key concept: The invention of the microscope made it possible for people to discover and learn about cells. • Robert Hooke • one of first people to observe cells • built his own microscope- one of the best of his time • observed cork which looked like small rectangular rooms they called cells

  4. First Observations of Cells Anton van Leeuwenhook • Dutch businessman • Built simple microscopes in his spare time • Looked at drops of lake water, scrapings from teeth and gums, water from rain gutters Animalcules- means “little animals,” small organisms that moved that he found in things like lake water

  5. Development of the Cell Theory • Schleiden- all plants are made of cells • Schwann- all animals are made of cells • Virchow- new cells are formed only from cells that already exist • Until these men’s time people believed that cells can come from non-living matter

  6. Cell Theory An explanation of the relationship between cells and living things • All living things are made of cells. • Cells are the basic units of structure and function • All cells are produced from other cells

  7. Unicellular and Multicellular • Unicellular- single celled • Multicellular- many cells • Key concept: “In multicellular organisms, cells are often organized into tissues, organs, and organ systems. • Tissue- a group of singular cells that work together • Organs- is made up of different kinds of tissue • Organ system- a group of organs wanted to what those

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