Lysozyme in tears and other secretions - particles by cilia in nasopharynx Mucus lining trachea Skin surface (physical barrier), fatty acids, normal flora Stomach (pH 2) Rapid pH change Normal flora Flushing of urinary tract 33. From the figure, explain how each mechanism serves as a defense agalnst infection.

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Substance Abuse

Substance abuse refers to the use of illegal drugs in excessive quantities, as well as the misuse of legal substances such as prescription or over-the-counter pharmaceuticals or alcohol for purposes other than those intended. Drug addiction, also known as substance use disorder, is a disease that affects the brain and behavior of a person. It leads to a failure to control the use of any drug or prescription, legal or illegal.