Intact keratinized epidermis and mucous membranes are strong mechanical barriers to most microorganisms and serve as the body's first line of defense.
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Q89: Antibodies can inactivate an antigen in many
Q90: Antibodies, or immunoglobulins, are secreted by activated
Q91: The innate (nonspecific) defense system and adaptive
Q92: The most important function of the thymus
Q93: B cells become immunocompetent in the thymus.
Q95: The constant region of the antibody joins
Q96: Antigen-presenting cells (APCs) engulf antigens and present
Q97: B lymphocytes (B cells) and T lymphocytes
Q98: The nonspecific defense by which complement proteins
Q99: Chemicals secreted by white blood cells and
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