HOST DEFENSE1 - 1 HOST DEFENSES (RESISTANCE) 4. Ears a....

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1 HOST DEFENSES (RESISTANCE) 4. Ears a. Auditory canal lined with ciliated epithelium b. Ceruminous glands 1). Secrete cerumin (wax) 2). Traps microorganisms - moves out away from middle ear due to beating action cilia c. Eardrum - mechanical barrier 5. Digestive tract a. Lined with m.m., coated with mucus b. Oral cavity - saliva contains digestive enzymes c. Stomach - HCl, enzymes, bile salts d. Intestinal tract 1). Diverse normal flora - some produce by-products called bacteriocins 2). Inhibit growth potential pathogens 6. Urinary tract a. Lined with m.m., coated with mucus b. Outward flow of urine - cleansing action c. Sphincter muscle - mechanical barrier d. Acid pH urine - pH 4.0-5.0 7. Reproductive systems a. Males - same as urinary tract b. Females 1). Vagina lined with mucus membranes 2). Mucus secretions - acid pH (due to estrogen) 3). Outward movement of mucus secretions eliminates some microorganisms 8. Circulatory systems a. Blood, lymph b. Protected by phagocytes c. Interferon, Complement 9. CNS a. Bone spinal and cranial cavities
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HOST DEFENSE1 - 1 HOST DEFENSES (RESISTANCE) 4. Ears a....

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