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www.GOALias.blogspot.comSometimes when you eat in a hurry, talk or laugh while eating, you may gethiccups or a choking sensation. This happens when food particles enter thewindpipe. The windpipe carries air from the nostrils to the lungs. It runs adjacentto the foodpipe. But inside the throat, air and food share a common passage.Then how is food prevented from entering the windpipe? During the act ofswallowing a flap-like valve closes the passage of the windpipe and guides thefood into the foodpipe. If, by chance, food particles enter the windpipe, we feelchoked or get hiccups.Fig. 2.6 Regions of thetongue for different tastes5. Now write down your observationsand label Fig. 2.6.Repeat this activity with otherclassmates.The foodpipe/oesophagusThe swallowed food passes into thefoodpipe or oesophagus. Look at Fig. 2.2.The foodpipe runs along the neckposition of taste buds by the followingactivity.Activity 2.41. Prepare a separate sample each of(i) sugar solution, (ii) common saltsolution, (iii) lemon juice and (iv) juiceof crushed neem leaf or bitter gourd.2. Blindfold one of your classmates andask her/him to take out the tongueand keep it in straight and flat position.3. Use a clean toothpick to put theabove samples one by one ondifferent areas of the tongue asshown in Fig. 2.6. Use a newtoothpick for each sample.4. Ask the classmate which areas of thetongue could detect the sweet, salty,sour and bitter substances.Paheli wants to know howfood moves in the oppositedirection during vomiting.FoodAlimentary canalStomachFig. 2.7 Movement of thefood in the alimentary canalNUTRITIONIN ANIMALS1515