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Answer these questions.....

Dear student,

1. Digestion starts from our buccal cavity (mouth), & as soon as food enters our mouth, the salivary amylase enzyme breaks down the carbohydrate into maltose. Now the food after breakdown is now called bolus. As the bolus reaches the stomach, the salivary amylase associated with the bolus stops working due to acidic nature of the stomach. Hence, carbohydrates are not digested in the stomach.

2. Lungs do not collapse when we breathe out as some air always exists in the lungs due to intra pleural pressure.

Regards

 

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As the bolus of food travels through the esophagus to the stomach, no significant digestion of carbohydrates takes place. The esophagus produces no digestive enzymes but does produce mucous for lubrication. The acidic environment in the stomach stops the action of the amylase enzyme.
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2.The trachea or the windpipe connects the pharynx and larynx to our lungs. This allows air to pass in and out of the lungs. As the trachea is made of cartilaginous rings which are of C shape, it prevents the air passage not to collapse when we breathe out air
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