ANSC 2340 Chapter Notes - Chapter 6: Dense Irregular Connective Tissue, Epithelial Root Sheath, Dermis
15 Jan 2017
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Integument: skin, feathers, horns, hooves | pages 147-168 (150-51, 156-57, 166) Integument largest and most extensive organ in the body. Covers and protects underlying structures and forms a critical barrier b/w inner body and external elements. Integumentary system skin, horns, hooves, claws, glands and hair. Possesses a remarkable ability to regenerate and heal. Outer shell of an animal/person is dead. Keratinization cells in deep layers give up vital organelles and nuclei to make room for the tough protective substance called keratin: cells expire and form vital protective barriers that help an animals survive. Most important function is to prevent dryness and rampant infection. Assists in maintenance of normal body temperature, excretes water, salt and organic waste. Involved in the synthesis of vitamin d and storage of nutrients. Skin forms 2 distinct layers: epidermis, dermis: these layers are separated by an epithelial basement membrane, dermal papillae projections that help anchor the 2 layers together.
