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Cells 1.1 Discovering Cells: Cell Theory What are Cells? Cells are the basic units of structure and function in living things. http://www.youtube.com/watch?v=u54bRpbSOgs What is the Cell Theory? The Cell Theory is a widely accepted explanation of the relationship between cells and living things. 1. 2. 3. It states: All living things are composed of cells. Cells are the basic units of structure & function in living things. All cells are produced from other cells. http://www.youtube.com/watch?v=4OpBylwH9DU Seeing Cells Robert Hooke discovered cells in 1663. He was looking at cork. Anton van Leeuwenhoek was the first to see living cells. Schleiden, Schwann, & Virchow contributed to the cell theory. ◦ Schleiden concluded all plants are made of cells. ◦ Schwann concluded all animals are made of cells. ◦ Virchow proposed that new cells form only from existing cells.