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Introduction to Cells

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Introduction to Cells Introduction to Cells Presentation Transcript

  • BellRinger
    What do you think a cell is?
    Can you think of any cells you’ve heard of in the human body?
  • Agenda
    GUIDED NOTES: Introduction to Cells
    History of Cells Discovery
    Cell Theory
    Stem Cells & Specialization
    Complete tests if needed after lecture
    Make-Up tests tomorrow (Thursday)
  • The Cell: Building Block of Life
  • The Inner Life of the Cell
    This video is a high quality visualization of life inside of a single-white blood cell.
  • History of Cells: First Sighting
    In 1665, Robert Hooke used a microscope to examine a thin slice of cork
    What he saw looked like small boxes
    Hooke called them “CELLS” because they looked like small rooms
  • Close Up of Cork Slice & Drawing
  • History of Cells: First Living Cells
    In 1673, Anton Von Leeuwenhoek (a Dutch microscope maker), was first to view living cells
    Leeuwenhoek used a simple, handheld microscope to view tiny creatures in pond water & scrapings from his teeth
  • Video of Microscopic Pond Organisms
  • History of Cells: Plants & Animals
    In 1838, a German botanist named Matthias Schleiden concluded that all plants were made of cells
    In 1839, a German zoologist named Theodore Schwann concluded that all animals were made of cells
  • Plant and Animal cells Under Microsope
  • History of Cells: Cell Division
    In 1855, a German medical doctor named Rudolph Virchow used a microscope to observe cells dividing
    He reasoned that all cells must come from other pre-existing cells by cell division
  • Video of Cell Division
  • Cell Theory
    The Cell Theory summarized all scientific knowledge about cells into 3 statements.
    1) All living things are made of cells.
    2) New cells are created by old cells dividing into two.
    3) Cells are the basic building units of life.
  • Unicellular & Multicellular Life
    Unicellular Life– Composed of one cell. These are small things like bacteria.
    Multicellular Life- Composed of many cells. All plants & animals are multicellular.
  • Cell Specialization
    In multicellular organisms, cells within the body are designed for different jobs.
    Cells begin as an unspecialized type called Stem Cells
    These stem cells can transform into more specialized types when they are exposed to chemical signals
  • Tissues
    Specialized cells are organized into groups called tissues.
    Muscle Tissue
    Bone Tissue
    Skin Tissue
  • 18
    Specialized Plant cells
    Guard Cells
    Pollen
    Xylem cells
  • Write the name and describe the appearance of the cells Mr. Bowden Shows. . .
  • Red Blood Cells
  • Bone Cells
  • Epithelial Cells
  • Muscle Cells
  • Nerve Cells
  • BrainPOP: Cells Overview
  • Assignments
    13 Review Questions
    Short Reading on Stem Cell Therapy