. First book in physiology and hygiene . t slowly in order to give the teetha chance to grind up the food, and also to allow 52 — time for the saliva to become well mixed with thefood. Put out your tongue and look at it carefully ina mirror. Close your teeth together over yourtongue and draw it slowly back. You will see thatthe surface of your tongue is not smooth, but is covered with little red andwhite bunches. Inside of theseare tiny taste-buds. It is theselittle taste-buds that enable usto taste our food. From the Mouth to theStomach. — At the back ofyour mouth is an is the be
. First book in physiology and hygiene . t slowly in order to give the teetha chance to grind up the food, and also to allow 52 — time for the saliva to become well mixed with thefood. Put out your tongue and look at it carefully ina mirror. Close your teeth together over yourtongue and draw it slowly back. You will see thatthe surface of your tongue is not smooth, but is covered with little red andwhite bunches. Inside of theseare tiny taste-buds. It is theselittle taste-buds that enable usto taste our food. From the Mouth to theStomach. — At the back ofyour mouth is an is the beginning of yourthroat. In your throat thereare two downward one at the front is thewindpipe. The air that youbreathe in throu£:h the mouthor the nose goes down through this pipe into thelungs. The passage back of the windpipe is theone through which the food passes from the mouthto the stomach. This is a tube about nine incheslong, and is called the esophagus. You can hardlycount five before a swallow of food from your. — 53 — mouth is down your esophagus and into yourstomach. Why doesnt the food get by mistake into thewindpipe ? It may if you laugh or talk while youare eating, and then you will choke. But everytime you swallow, whether food or only the salivain your mouth, the top of the windpipe closesagainst a little door or cover, so that neither foodnor saliva can go down the wrong way. Stomach Digestion.—The lower end of the esoph-agus opens into a kind of bag. This bag is thef^tomach. The walls of the stomach are very stomach is quite flat when it is empty, and wellrounded out after a hearty meal. The stomach narrows again at its lower end andforms the beo:innino; of another tube. Here is alittle gate-keeper, or valve, called the pylorus. Thislittle valve will not open to let the food into thelower tube until the stomach is quite throughwith it. In the walls of the stomach are numberless littlepockets, or glands. These store up a fluid
Size: 1186px × 2108px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidfirstbookinp, bookyear1902
