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Introduction to Cells EQ: What ideas make up the cell theory? Robert Hooke naturalist, philosopher, inventor, architect.... (July 18, 1635 - March 3, 1703) In 1665 Robert Hooke ROBERT HOOKE: publishes his book, looked at cork with a Micrographia, which microscope and saw contains his drawings of sections of cork as seen little structures he through one of the first called “cells” microscopes (shown at right). He was the first person to use the term “cells”. Anton van Leeuwenhoek 1632-1723 In 1673 Anton van Leeuwenhook LEEUWENHOEK: perfects the simple looked at water with microscope and microscope and saw observes cells and microorganisms. tiny living organisms He discovered (microorganisms) bacteria in 1674 and four years later, he discovers protozoa. a Cell Theory Matthias Schleiden Theodore Schwann all plants are made all animals are made of cells of cells Cell Theory Rudolf Virchow all cells came from pre-existing cells Cell Theory Matthias Schleiden concluded that all plants are made of cells (1838) Theodore Schwann concluded that all animals are made of cells (1839) Rudolf Virchow concluded that all cells came from pre-existing cells (1855) Cell Theory • all living things are made up of cells • cells are the basic units of structure and function in an organism • new cells are produced from existing cells The Levels of Organization Multicellular organisms are arranged from simple to complex according to their level of cellular grouping. cell tissue organ organ system organism Levels of Organization What is the benefit of being made of all of these cells? Level Function Organ system Different organs function together Organ Different tissues function together Tissues Cells Similar cells function together Cells can perform special jobs Example Nervous System Brain Nervous Tissue Neuron