AEMCA Practice Exam

Where in the human body is flora typically found?

1. Skin and GI tract

2. Only in the respiratory system

3. In the bloodstream

4. On external surfaces only

The correct answer is: Skin and GI tract

Flora, also known as microbiota, refers to the diverse community of microorganisms that inhabit various regions of the human body. The skin and gastrointestinal (GI) tract are two primary locations where these beneficial microorganisms thrive. The skin is home to a variety of microorganisms that contribute to the immune system and help protect against pathogenic bacteria. The GI tract, particularly the intestines, harbors a complex and dense population of bacteria that aid in digestion, synthesize essential vitamins, and protect against harmful microbes. The other options are not as comprehensive. For instance, the respiratory system does have some microbial presence, but it is not the primary site. The bloodstream is typically a sterile environment under normal conditions, devoid of flora, as the presence of microorganisms in the bloodstream indicates a potential infection. Lastly, while flora can be found on external surfaces, it is not limited to those areas, as the GI tract represents one of the most populated sites in the body. Thus, the correct answer encompasses the key locations where diverse and beneficial flora are commonly found.