BIOL 1011 Lecture : Lecture 24 Specific Defenses Of The Host
Document Summary
Lecture 24 resistance to disease {hosts defense barriers: a. nonspecific resistance- chapter 20 (innate immune response) The body defenses that protects the body against any kind of pathogen: b. The body acquires these defenses against specific microorganisms: [note: up to 10% of our genes may help build or operate body defenses. ] Nonspecific resistance: first line of defense mechanical barriers and. Normal microbiota: skin tough environment for microbial growth. Skin consists of two distinct layers of cells: dermis(inner) and epidermis (outer). Top layer of epidermal cells is dead and contains a protective protein called keratin. Skin continued: dry, except for moist areas like underarms and genital areas, antimicrobial compounds are produced by the skin. Sebaceous (oil) gland produce an oily substance called sebum: sebum unsaturated fatty acid and lactic acid, lactic acid - keep skin ph between 3 and, sebum prevents hair from drying and becoming brittle.
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