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Epithelial layer of mucous membranes aids in the

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Epithelial layer of mucous membranes aids in the body’s defencesystem because it is a barrier that microbes and otherpathogens have difficulty penetrating. Has tight junctionsconnecting the cells, so material cannot leak in between them.Goblet cells of the epithelium layer of mucus membranes secretemucus- a slippery fluid to prevent cavities from drying out.Epithelium layer secreted enzymes needed for digestion and siteof food and fluid absorption in GI tract. Mucus membranes ofsmall intestine is nonciliated simple columnar epithelium, largeairways to lungs consist of pseudostratified ciliated columnarepithelium.a.lamina propria---connective tissue of mucus membrane isareolar connective tissue and is called the lamina propria, sonamed because it belongs to the mucus membrane. Supportsthe epithelium, binds it to underlying structures, allowsflexibility of the membrane, provides protection forunderlying structures, it holds blood vessel in place, is avascular source for the overlying epithelium. Oxygen andnutrients diffuse from the lamina propria to coveringepithelium, carbon dioxide and wastes diffuse in oppositedirection.III. serous membrane or serosa---(watery). Lines a body cavity thatdoes not open directly to the exterior, it covers the organs withinthe cavities. . consists of areolar connective tissue covered withmesothelium (simple squamous epithelium)a.parietal and visceral layers—two layers of serous membranes.Parietal layer is a layer of serous membrane attached to and liningthe cavity wall; visceral layer covers and adheres to the organswithin the cavity. Themesothelium of a serous membrane secretesfluid, a watery lubricant that allows organs to glide easily over oneanother or slide against the wall of cavities.b.pleura, pericardium, peritoneum---serous membrane lining thethoracic cavity and covering the lungs is the pleura; the serousmembrane lining the heart cavity and covering the heart is called
the pericardium; the serous membrane lining abdominal andcovering the abdominal organs is the peritoneum.IV.cutaneous membrane or skin---covers the entire surface of thebody and consists of superficial portion called epidermis and a deeperportion called dermis. The epidermis Consists of keratinized stratifiedsquamous epithelium, which protects the underlying tissues; thedermis consists of dense irregular connective tissue and areolarconnective tissue.

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Term
Fall
Professor
Leonardo
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