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3: The Tissue Level of Organization

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    • 3.1: Introduction to the Tissue Level of Organization
    • 3.2: Types of Tissues
      The term tissue is used to describe a group of cells found together in the body. The cells within a tissue share a common embryonic origin. Microscopic observation reveals that the cells in a tissue share morphological features and are arranged in an orderly pattern that achieves the tissue’s functions. From the evolutionary perspective, tissues appear in more complex organisms. For example, multicellular protists, ancient eukaryotes, do not have cells organized into tissues.
    • 3.3: Epithelial Tissue
    • 3.4: Connective Tissue Supports and Protects
    • 3.5: Muscle Tissue
    • 3.6: Nervous Tissue
      Nervous tissue is characterized as being excitable and capable of sending and receiving electrochemical signals that provide the body with information. Two main classes of cells make up nervous tissue: the neuron and neuroglia. Neurons propagate information via electrochemical impulses, called action potentials, which are biochemically linked to the release of chemical signals. Neuroglia play an essential role in supporting neurons and modulating their information propagation.

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