chapter 41

chapter 41 - 1. what are peristalsis and sphincters, and...

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1. what are peristalsis and sphincters, and what are their functions in digestion? Peristalsis is contraction by smooth muscles in the wall of the alimentary canal that push the continue pushing food along the tract. Along this tract are sphincters, ring-like valves, which regulate the passage of material between different chambers along the canal. These are prime components of the alimentary canal, which functions in absorption and digestion 2. if food ‘goes down the wrong pipe,’ what has really happened? The pharynx is a junction that opens to both the esophagus and the windpipe. When the bolus is swallowed, the top of the windpipe moves up so that the glottis is blocked by the epiglottis. In turn, the bolus is sent down the esophagus, the other opening of the pharynx. On rare occasions, however, the swallowing reflex does not block the opening of the windpipe in time, and the bolus or liquid may travel ‘down the wrong pipe.’ 3. if you have some egg protein and you add some pepsinogen, very little of the egg protein will be digested. What would you add to the mixture in order to enhance the activity of this digestive enzyme? Pepsinogen is an inactive enzyme located within the gastric pits of the
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chapter 41 - 1. what are peristalsis and sphincters, and...

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