where do the resident microorganisms reside in the skin
Skin flora Many of them are bacteria of which there are around 1000 species upon human skin from 19 phyla.[1][2] Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.
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Small intestine Food from the stomach is allowed into the duodenum through the pylorus by a muscle called the pyloric sphincter.
Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.