digestion II

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1、F.4BiologyClassExerciseDigestionoffoodIIName:___________________________Class:_______Group:______1.Thediagramsbelowshowsomepartsofthehumandigestivesystem.(AtoH)lonrectumileumFAFFEEGAFFEEHAFFEE.BCDEA(a)UsingthelettersinthediagramONLY,completethetablebelow:DescriptionsPart(s)1.Peristalsisoccursi

2、n2.Theybelongtothealimentarycanal3.Theysecretedigestiveenzymes4.Itsecretestheenzymelipasesonly5.Theyabsorbwaterfromfood6.Itabsorbsmostwaterfromfood.7.Itabsorbsdigestednutrients.8.Itabsorbswaterfromundigestedfood.9.Itsecretesadigestivejuicewithnoenzyme.10.Thewallcontainsmucus11.Mechanicaldigest

3、ionoffoodoccursin12.Itsecretesbile13.ItcontainsbacteriathatproducevitaminK.14.Itisthelongestpartofthealimentarycanal.F.4BiologyClassexerciseDigestionoffoodIIPage32.Completethefollowingtabletoshowwherestarch,proteinandfataredigestedinthealimentarycanal.Putaüinthecorrectboxes.starchproteinfat1.M

4、outh2.Oesophagus3.Stomach4.Smallintestine5.LargeintestineLevelII:Questionsfordiscussion:(12marks)1(a)Whichpartofthealimentarycanalisthelongest?_______________________(1mark)(b)Canyouguesshowlongitis?__________m(1mark)(c)Whyisitsolong?(4marks)____________________________________________________

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7、________________________________________________________________2.Theinnersurfaceofthewholealimentarycanaliscoveredbyalayerofmucus(sticky,wateryliquid).(a)Suggesttwogeneralfunctionsofthislayerofmucus.(2marks)____________________________