 Hey everybody, Dr. O here. This is where we're going to talk about the two types of sweat glands, also known as pseudoriferous glands, but the last time you'll hear me say that. So we have what are called apocrine and marocrine or acrine sweat glands. So aprican sweat glands, you're going to find them, armpits, nipples, and groin. So these are going to be the sweat glands that they're controlled more by your autonomic nervous system and hormones. They all function as a unit, so they're basically turned on or turned off together and they produce a very thick, sticky, cloudy sweat. What's special about this sweat is this sweat is food for microorganisms. So the microorganisms will actually digest and consume and ferment or whatever, this thick, sticky, cloudy sweat, and then they produce odor. So the body odor is actually the off-gassing or metabolism of microbes that are eating this aprican sweat. So this sweat, generally not a big deal until you hit puberty, then stress and hormonal responses are going to kick in. Anyone that's ever had a young child, especially a boy, has probably had to have a conversation with some point that now they stink and they've got to start to take better care of themselves and that's going to be where this aprican sweat comes into play. As far as its functions, overall, function as a pheromone is unknown. There's not a lot we know about human pheromones yet, but it's believed that aprican sweat could play a role in this communication, this pheromone communication, especially because it's linked to reproductive years and puberty, those types of things, but not really sure. So that's aprican sweat gland. It also might reduce friction in places like the armpits and the groin. So that's aprican sweat. Armpits, nipples, groin produces the thick, sticky, cloudy sweat that ends up causing body odor when microbes metabolize it. Then we have merochrine or as you see here, acrine sweat glands. I call them merochrine sweat glands. These are going to be all over your body. The palms of your feet, soles of your hands are going to have the most as is your forehead. So those are going to be places where you see a lot of American sweat glands. Think cooling here. So the American sweat glands, they're controlled independently. So if a part of your body starts to warm up, then merochrine sweat glands are going to release sweat, and then sweat is going to help cool your body off with what's called sweat evaporation. As sweat evaporates off your body, it pulls heat with it. This works really well, especially if it's not humid. In a hot, humid environment, merochrine sweat doesn't work as well because sweat will pool. It won't evaporate off of you. It'll basically pour off your body, and that's why it's so much harder to get cool when it's humid. But we talked about thermal regulation somewhere else. So American sweat independently. The example I always give here is if you put your right arm in the stove, don't touch the stove, but if you're reaching in to get something out or whatever, then your right arm is going to get hot, and your right arm is going to start to sweat. That shouldn't cut it. So only parts of your body that are overheating are going to sweat. Whereas apricon sweat glands are controlled uniformly. American sweat glands are controlled independently. So American sweat, think sweat evaporation, cooling the body, the sweat we normally think of. And then we already talked about apricon sweat glands. So those are your two types of sweat glands, apocrine, and merochrine or acrine sweat glands. I hope this helps. Have a wonderful day. Be blessed.