![]() SCIENTISTS ARE WORKING ON A DEODORANT THAT WOULD KILL ONLY SOME BACTERIA… That creates a product known as thioalcohols, whose oniony, meaty scents you're likely familiar with if you've ever been stuck in a crowded elevator, subway, or gym at peak workout time. The bacteria that live in the moist crevices of your armpits interact with your sweat, which contains volatile fatty acids and odorous steroids (among other compounds). Bacteria break down the compounds, and those breakdown products stink," says Berezow. "The secretions our armpits make don't stink. So one person's armpit bacteria won't necessarily be the same as somebody else's." 4. " One study showed, after sampling nine people, that there were three types of armpit bacterial communities: One was dominated by Betaproteobacteria, a second by Corynebacterium, and a third by Staphylococcus. Not only that, but armpit microbiomes vary from person to person. Compared to other parts of our skin, armpits are rather densely populated, he explains. "Because of oil and sweat secretion, the armpit provides a nice home for many different kinds of bacteria," Berezow tells Mental Floss. This microbiome can vary depending on the body part-so the bacteria on your hand can be vastly different from the moist, warm, dank environment of your armpits. Your skin is home to many different kinds of bacteria, some of which are quite beneficial, collectively known as a microbiome. These glands are copious in places with more hair follicles, and the sweat they secrete tends to be thicker. However, your armpits are abundant in apocrine glands (also found in your groin). Eccrine glands cover most of the surface of your body, and are responsible for that thin sheen of sweat on your brow and extremities during heat and exercise. In fact, your skin has two types of sweat glands that help to cool you down: eccrine glands and apocrine glands. THEY PRODUCE A DIFFERENT KIND OF SWEAT FROM OTHER BODY PARTS. In some kinds of breast cancer, these affected lymph nodes may have to be surgically removed. They also produce a variety of immune cells known as lymphocytes that fight infection. (One clump is closer to the surface than the other.) These lymph nodes are actually an important part of your body's immune system and serve to filter toxins out of tissues. In the small hollow of each armpit are a surprisingly large number of lymph nodes, approximately 20, in two clumps, though you can't usually feel them unless they're swollen. YOUR ARMPITS ARE CHOCK FULL OF LYMPH NODES. Mental Floss spoke to microbiologist Alex Berezow, a senior fellow of biomedical science with the American Council on Science and Health, about this often overlooked spot. But it's also an important juncture that protects important lymph nodes and soft tissue. the axilla-is often the source of unpleasant odors and embarrassing wetness, and a hairy font of annoyance. Tucked away in that damp crevice between your arm and torso, the armpit-a.k.a. ![]() Think of it as a mini digital encyclopedia with a dose of wow. Our series The Body explores human anatomy, part by part. And yet most of us don't know enough about it: its features, functions, quirks, and mysteries. For each one of us, it's the most intimate object we know.
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