英文写细胞的作用,结构请用英文写出下列细胞的作用以及结构对作用的影响?musclecellnervecellredbloodcellepithelialcelleggcellspermcellwhitebloodcell
英文写细胞的作用,结构
请用英文写出下列细胞的作用以及结构对作用的影响?
musclecellnervecellredbloodcellepithelialcelleggcellspermcellwhitebloodcell
Thecellisthebasicstructural,functionalandbiologicalunitofallknownlivingorganisms.Cellsarethesmallestunitoflifethatisclassifiedasalivingthing,andareoftencalledthe"buildingblocksoflife".
Cellsconsistofaprotoplasmenclosedwithinamembrane,whichcontainsmanybiomoleculessuchasproteinsandnucleicacids.[1]Organismscanbeclassifiedasunicellular(consistingofasinglecell;includingmostbacteria)ormulticellular(includingplantsandanimals).Whilethenumberofcellsinplantsandanimalsvariesfromspeciestospecies,humanscontainabout100trillion(1014)cells.[2]Mostplantandanimalcellsarebetween1and100micrometresandthereforearevisibleonlyunderthemicroscope.[3]
ThecellwasdiscoveredbyRobertHookein1665.Thecelltheory,firstdevelopedin1839byMatthiasJakobSchleidenandTheodorSchwann,statesthatallorganismsarecomposedofoneormorecells,thatallcellscomefrompreexistingcells,thatvitalfunctionsofanorganismoccurwithincells,andthatallcellscontainthehereditaryinformationnecessaryforregulatingcellfunctionsandfortransmittinginformationtothenextgenerationofcells.[4]CellsemergedonEarthatleast3.5billionyearsago.[5][6][7]