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3/29/2012 How can one cell become a multicellular organism? Levels of Organization • How do unicellular and multi-cellular organisms differ? • How does cell differentiation lead to the organization within a multi-cellular organism? Levels of Organization • cell differentiation • stem cell • tissue • organ • organ system Unicellular Organisms Unicellular Organisms (cont.) • • 1 3/29/2012 Multi-cellular Organisms Multi-cellular Organisms (cont.) cell differentiation How do unicellular and multicellular organisms differ? Multi-cellular Organisms (cont.) Stem cells Tissues are groups of similar types of cells in multi-cellular organisms that work together to carry out specific tasks. tissue from Latin texere, means “weave” 2 3/29/2012 • Humans, like most other animals, have four main types of tissue: muscle, connective, nervous, and epithelial. • Organs are groups of different tissues working together to perform a particular job. • The three main types of plant tissue are dermal, vascular, and ground tissue. Organ systems are groups of different organs that work together to complete a series of tasks. Multi-cellular Organisms (cont.) How does cell differentiation lead to the organization within a multi-cellular organism? 3 3/29/2012 • A unicellular organism carries out all the activities necessary for survival within one cell. • Cells become specialized in structure and function during cell differentiation. • Organs are groups of different tissues that work together to perform a job. 4