BIOL 221 Lecture Notes - Lecture 1: Connective Tissue, Reticular Fiber, Elastic Fiber
Document Summary
Connective tissues- different type of cells (bone, blood) Components of connective tissue: types of cells, blast- makes something, phagocytes- destroy things, fibroblasts- makes fibers (collagen, reticular, elastic) Grand substance: macrophages- phagocytes, adipocytes- store lipids, mast cells- carry histamine (increases blood flow) and heparin (prevents blood clotting, lymphocytes, neutrophils (engulf things), eosinophils (attack parasitic worms) and plasma cells- Wbc, all fall into immune system: fibers, collagen fibers- long straight and unbranched, flexible but stronger than steel, reticular fibers- thin and branching, tough and flexible, provide framework, elastic fibers- branched, wavy, stretchable and strong. Loosely organized fibers, abundant blood vessels and a lot of seemingly empty space. Underlies epithelia, in serous membranes, between muscles, passageways for nerves and blood vessels: adipose tissue: (fig 4. 10b)- storage, insulation and cushioning. Empty looking cells with in margins, nucleus pressed against ell membrane: reticular tissue: (fig 4. 10c)- supporting frame work, solid organs and lymph nodes.
