How the snake breath
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Snakes have nostrils, just like humans, and they breathe through them and use them to smell. However, their best sense of smell comes from using their tongue, and they can also breathe through their mouths, like humans, by using their glottis
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Snakes breathe principally by contracting muscles between their ribs. Unlike mammals, they lack a diaphragm, the large smooth muscle responsible for inspiration and expiration between the chest and abdomen. ... The portion of a snake's lung nearest its head has a respiratory function; this is where oxygen exchange occurs.
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