ZOO 3000 Lecture Notes - Lecture 3: Elastin, Heparin, Eosinophil
27 Jul 2018
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The most abundant, widespread and varied of all tissue types i. e. (cid:271)lood, adipose tissue, (cid:271)one, (cid:272)artilage, loose ct, dense ct : has the widest variety of functions. Earliest cts: mesophyl of sponges matrix of collagen and glycoproteins, mesoglea of cnidarians and ctenophores more jelly-like. ++proteoglycans: coelom walls of bilateria, allowed more specialization (i. e. hemal system and blood) Connective tissue: 3 main components, cells, fibrous components. Form extracellular matrix (ecm: amorphous intercellular (ground) substance. Two definitions: morphology (separation between cells, continuous compartment with distinct basic functions vs. other primary tissues, cell types, fibroblasts, mast cells, plasma cells, macrophages, adipose cells, eosinophils, neutrophils. Features different proportion of cellular, fibrous and amorphous components. Loose: mesenchyme, mucoid connective tissue, areolar, adipose tissue, reticular tissue, dense. Lose connective tissues (lct: mesenchyme embryonic connective tissue. Loose, irregular: sparse collagen and fibroblasts, cells are pluripotent, source for all connective tissues, mucoid connective tissue, embryonic connective tissue (found in umbilical cord, contains:
