關(guān)于消化系統(tǒng)的英文PPT_第1頁
關(guān)于消化系統(tǒng)的英文PPT_第2頁
關(guān)于消化系統(tǒng)的英文PPT_第3頁
關(guān)于消化系統(tǒng)的英文PPT_第4頁
關(guān)于消化系統(tǒng)的英文PPT_第5頁
已閱讀5頁，還剩15頁未讀， 繼續(xù)免費(fèi)閱讀

下載本文檔

版權(quán)說明：本文檔由用戶提供并上傳，收益歸屬內(nèi)容提供方，若內(nèi)容存在侵權(quán)，請進(jìn)行舉報或認(rèn)領(lǐng)

文檔簡介

1、TheDigestiveSystem(alsocalledthegastrointestinaloralimentarycanal),Theprimaryfunctions,IngestionDigestionAbsorptionElimination,Introduction,Anatomically,thedigestivesystemconsistofa30-footlong,mucousmembrane-linedtubebeginningwithmouthandendingwiththeanus,Thedigestivesystem,MouthPharynxEsophagusStom

2、achSmallintestineLargeintestineLiverGallbladderPancreas,Accessoryorgansofthedigestivesystem,Theoralcavity,TheteethThetongueThepalate,Chewingandswallowing,Theteethareusedtocut,tearandcrushfoodintosmallerpieces.Eachtoothconsistsofpulp,cementumandenamel.Theteethareclassifiedincisors,cuspidsandmolars.Th

3、etonguemanipulatesfoodinthemouthduringmasticationanddeglutition.Thepalatethehardplateandthesoftplate(theuvulahangingfromthesoftplate),Thepharynxorthroat,isalongmusculartubethatservesasapassagewayforfoodfromthemouthtotheesophagusandasapasswayforairfromnosetothewindpipe.Theesophagusisalongmusculartube

4、extendingfromthepharynxtothestomach.Foodispropelledbyrhythmiccontractionsofmusclesinthewalloftheesophagus.Thisprocessiscalledperistalsis.,ThestomachItiscomposedofanupperportioncalledfundus,amiddlesectionknownasthebodyandalowerportion,calledtheantrum.Thecardiacsphincterrelaxesandcontractstomovefoodfr

5、omtheesophagusintothestomach,whereasthepyloricsphincterallowsfoodtoleavethestomachwhenitsufficientlydigested.Asthestomachfills,therugaeunfolded,exposingthedigestiveglandsandstimulatingthemtosecretdigestiveenzymesandhydrochloricacid.Thesesubstanceshelptransformfoodpresenttoasemifluidsubstance.,Thesma

6、llintestineistheregionofthegutwherenearlyallofthechemicaldigestionofthenutritioncomponentsoffoodtakeplace.Itdividedinto3sections:1)theduodenum2)thejejunum3)theileumInthewalloftheentiresmallintestinearemillionsofvilli.Itisthroughthecapillariesinthevillithatcompletelydigestednutrientspassintothebloods

7、treamandlymphvessels.,Thelargeintestineisdividedinto4parts:cecum,colon,sigmoidcolon,andrectum.,Thececumisconnectedtothesmallintestinebytheileocecalvalve.Thecolonhas3divisions:theascendingcolon,thetransversecolon,thesigmoidcolon.Asfluidwastefromthesmallintestinepassthroughvarioussectionsofthecolon,wa

8、terisreabsorbedintobody.Therectumservesasareservoirforfeces.,Theliver:locatedintheupperrightquadrantofabdomen,producesbile.Besidesproducingbile,ithasseveralothervitalfunctions.Itmanufacturesbloodproteins,destorysolderythrocytesandreleasesbilirubin,removespoisons(detoxification）fromtheblood,storesandreleasesglycogenneededbythebody.,Thegallbladder：apear-shapedsacbehindthelowerportionoftheliver,storesbile,whichiscontinuouslysecretedbythehepaticcellsbetweenmeals.,Thepancreas:behindthestomach,manufacturesdigestivejui

溫馨提示

  • 1. 本站所有資源如無特殊說明，都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
  • 2. 本站的文檔不包含任何第三方提供的附件圖紙等，如果需要附件，請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
  • 3. 本站RAR壓縮包中若帶圖紙，網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽，若沒有圖紙預(yù)覽就沒有圖紙。
  • 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
  • 5. 人人文庫網(wǎng)僅提供信息存儲空間，僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理，對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯，并不能對任何下載內(nèi)容負(fù)責(zé)。
  • 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容，請與我們聯(lián)系，我們立即糾正。
  • 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。

評論

0/150

提交評論