BIOB33H3 Chapter Notes - Chapter 3: Exocrine Gland, Endocrine Gland, Epithelium
Document Summary
Origins of connective tissues: mesenchyme - rst connective tissue to appear in the developing embryo. Contains star-shaped cells that are separated by a ground substance that contains ne protein laments. Tissues - collections of specialized cells and cell products that perform a relatively limited number of functions. Histology - the study of group of cells, tissues, and organs that work together to perform speci c functions. Protect exposed and internal surfaces from abrasion, dehydration, and destruction yy chemical or biological agents. Control permeability: any substance that enters or leaves the body has to cross an epithelium. Provide sensation: extensively innervated by sensory nerves. Unicellular gland: individual gland cells scattered among other types in an epithelium. Glandular epithelium: most or all epithelial cells produce secretions. Have microvilli ( 20x surface area for absorption and secretion) Stereo cilia - very long microvilli, incapable of movement.
