BIOS 213 Lecture Notes - Lecture 4: Body Plan, Phospholipid, Urinary System

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17 Sep 2016
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Tissue- a group of cells with similar functions. Most are joined with cell junctions: blood is an exception. It is connective tissue with no cell junctions. Gap junctions are communicating junctions which allows cells to share cytoplasm. Desmosomes- strongest anchoring junction, prevents rips in skin: metastasizing cancer cells lack desmosomes & other permanent anchoring proteins, not good at occluding. Primary types of tissues: 4 types: muscle, neural, connective, epithelial. Neural tissue: conducts electrical signals communication control, excitable cells, tissues, due to the ability to propagate electrical signals. Muscle tissue: movement & contraction of glands/ muscles, excitable, contractive. Connective tissue: provides structure and support, characterized by few cells relative to the amount of matrix or ground substance in ecf. Blood: red cells (erythrocytes, white cells (leukocytes, plasma (ions, water, proteins, cartilage, tendons, ligaments bone has dense matrix, adipose tissue, body fat, consists of adipocytes filled with triglyceride, energy storage, also cushions & protects internal organs.