有关大脑 part5 Hints： centigrade sleeve ducts--tubes

They are heart cells, and several million of them working at once is a heartbeat. In this case, it's your head that rules your heart as it's your brain that decides what rate your heart should be beating at. The same part of your brain that's controlling your heart is looking after the outside of you, too. Your body needs to maintain a constant temperature of 37 degrees centigrade and your brain has a range of tricks up its sleeve to do it.
This is skin magnified a thousand times. If you look closely, it's covered in holes. They are the openings of tiny ducts--tubes through which sweat can flow. There are about 65, 000 of them on the palm of your hand alone. If you are getting too hot, your brain switches on your sweat glands.

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