eli5: do boobs actually hold liquid milk or are they like camel humps?
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Both. There are two main organs that make up the boobs. One is just a big blob of fat, just like a camel hump. This makes up most of the boobs. The other organ is the mammary gland which primarily lies under the fat. It is sort of a long coiled up tube which can produce milk. When inactive the mammary gland is empty. But when producing milk it does fill the tube with some milk. So it is producing milk all day long and just stores it up for feeding.
The same organs are actually also found in men. The main difference is that normally the fat does not accumulate in a mans boobs, although fat men can often have just as big boobs as normal weight women. But the mammary gland is just the same, it is just harder to get a mans mammary gland to start producing milk without the hormones associated with pregnancy.
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