CHEM-C - Chemistry and Chemical Biology CHEM-C 106 Lecture Notes - Lecture 10: Stratum Spinosum, Basal-Cell Carcinoma, Stratum Basale
16 Jan 2017
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Unicellular organisms: -no epithelial covering, -plasma membrane, -ex. protists and sponges. Multicellular organisms: -have epithelial cells that are either: Integumentary system: -the body covering including the skin and its nails, glands, hair, and other associated structures; includes some specialized epithelial cells, -vertebrate integumentary system includes skin (epithelium and endodermis) and hypodermis. Epithelial coverings may be modified for special functions: examples gas exchange, digestion, secretion. Cuticles: membrane bound, outer layer mainly collagen, ex. nematodes. Functions across vertebrates and invertebrates: -mucus secretions, -enzyme secretions (digestion, -protection, -derived structures: ex. cuticles, shells, hooves, horns, scales, feathers. Cnidarians: -cnidocytes (discussed, -gland cells digestion, shell in corals, -epithelio-muscular cells (epidermis, -nutritive-muscular cells (endodermis) Surface ciliated epidermis: -rhabdite cells- produce mucus for protection and to trap prey. Provides protection against predation (taste: -gland cells secrete mucus, adhesive and releaser proteins. Specialized structures: glands (penetration and cysts, hold fast structures to attach to host intestine. Syncytial tegument external body covering of parasites.
