BSCI 201 Lecture Notes - Bone Marrow, Cytotoxic T Cell, Natural Killer Cell

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Document Summary

The body is constantly in contact with protists, bacteria, fungi, and viruses. The body has two defense systems for foreign materials. Responds immediately to protect body from foreign materials. Adaptive defense system (specific defense system) is a specific defense is required for each type of invader. We can develop immunity or specific resistance to certain pathogens. Skin is a physical barrier to foreign materials mucous membranes mucus traps microorganisms in digestive and respiratory pathways. Secretions from sebaceous and sweat glands (salty sweat), sebum is toxic to bacteria. Sebaceous glands secrete oily substances into hair follicles. Vaginal secretions are acidic ph of the skin is acidic to inhibit bacterial growth. Stomach mucosa and secrete hydrochloric acid, also has protein-digesting enzymes. Hydrochloric acid can also kill a lot of pathogens that exist or might exist on the food. Certain pathogens are dormant until they stay in contact with hydrochloric acid.

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