01:119:115 Lecture Notes - Myofilament, Sarcomere, Golgi Tendon Organ

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Epithelial tissue stomach, uterus etc and tissue surrounding body"s organs (peritoneum, pericardium, pleura) Cells that make up various linings in the body. In humans, includes outer layer of skin, inside of mouth, Outer epithelium can secrete: cuticle for protection, lubricants, adhesives, odorous, poisonous substances. Dermis: rests on subcutaneous tissue and adipose cells. Keratinocytes: mechanical strength, reduces water loss, continuously replaced. Cells divide, move to skin surface, keratinize; include melanocytes. Sits under epidermis: dense, fibrous connective tissue, collagen, blood vessels; hair follicles, sensory cells e. g. pacinian corpuscle and sweat (sebaceous) glands. Cold-blooded organisms and soft-bodied animals; epidermis with longitudinal contractile fibers encloses circular contractile gastrodermis; fluid filled. External skeleton, secreted by epidermis, supports and protects; chitin (insects), caco3 (mollusks), silica (diatoms) Bumps and spines of ca2+ covered by epidermis (echinoderms), cartilage (sharks) or living tissue; Thoracic vertebrae (part of vertebral column) together with 12 pairs of ribs (ribs 11, 12 are floating .

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