Normal flora are found in which body areas?

Normal flora are found in which body areas?

• A. On skin, in the GI tract, and in the respiratory tract.
• B. Only in the GI tract.
• C. Only on skin.
• D. Only in the respiratory tract.

Answer: (A)

Normal flora are the microorganisms that normally inhabit surfaces exposed to the environment without causing disease. They live on the skin and on mucous membranes, including the gastrointestinal tract and the upper parts of the respiratory tract. Each site hosts a characteristic community that helps protect against pathogens by occupying niches and contributing to immune development. Therefore, normal flora are found on skin, in the GI tract, and in the respiratory tract. (Lower, internal sterile sites like blood or deeper tissues are not routinely inhabited by these microbes.)

Normal flora are the microorganisms that normally inhabit surfaces exposed to the environment without causing disease. They live on the skin and on mucous membranes, including the gastrointestinal tract and the upper parts of the respiratory tract. Each site hosts a characteristic community that helps protect against pathogens by occupying niches and contributing to immune development. Therefore, normal flora are found on skin, in the GI tract, and in the respiratory tract. (Lower, internal sterile sites like blood or deeper tissues are not routinely inhabited by these microbes.)