字幕列表 影片播放 列印英文字幕 Hi, this is Emily from MinuteEarth. Supermarkets have lots of milks to choose from these days, many of which are the product of blending up and straining various nuts and seeds. Plain old milk milk, on the other hand, is also a strained product - it's filtered cow blood. As weird as this seems, all mammal milk is, in fact, made from blood, because blood contains lots of nutrients, and baby mammals need lots of sugar, fat, and protein to grow complex brains and bodies. But mammal mammas can't just open an artery; that would be dangerous. Plus, most of the useful nutrients in blood are too dilute and blood has too much iron for most babies to process. This is where the mammary gland comes in: It's full of thousands of tiny sacs whose walls have special cells that grab water and nutrients from passing blood, do some chemistry on them, and pass them to the inside of the sacs where they mix together to become milk. When a baby starts to suckle on the teat, its sucking pattern tells the mom's brain to the hormone release oxytocin, which attaches to the sacs, causing them to squeeze out the tiny droplets of milk into the baby's mouth. Each mammal species tailors its blood-filtering recipe to the needs of its babies. For example, to help their Arctic-dwelling pups pack on the blubber, hooded seal moms produce a milk with 15 times the fat of cow milk. Cottontail moms make high-protein milk for their bunny babies, allowing them to develop their hopping muscles quickly. The tammar wallaby can make two different types of milk in two different teats at the same time - one high in sugars for a newborn in the pouch and one high in fat and protein for her waddler. And while selectively bred modern dairy cows don't have a particularly wacky recipe for their milk, they sure make a lot of it. The current record holder - a Holstein named Aftershock - can produce a bathtub full of milk every day. That's udderly impressive. This video is sponsored by Honey, a free browser extension that looks for ways to save you money whenever you shop online. You can install Honey with just two clicks of the mouse by going to joinhoney.com/minuteearth. After that, any time you go through the checkout process at an online store, Honey will automatically apply the best coupon code it can find to give you the biggest discount. Last week, the MinuteEarth team saved seven bucks on this amazing chart of cosmic exploration from PopChartLab. And Honey doesn't make money by selling your personal data; instead, it collects a small commission from some merchants for bringing them customers. To join the nine million other people using Honey to save money online - and to support our channel - go to joinhoney.com/minuteearth.
B2 中高級 美國腔 牛奶只是過濾的血液 (Milk Is Just Filtered Blood) 124 8 Cyndi 發佈於 2021 年 01 月 14 日 更多分享 分享 收藏 回報 影片單字