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《The male reproductive system》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、ThemalereproductivesystemThemalereproductivesystemcontainstheseparts:testes(pronounced"test-eez")glandsspermductsurethrapenis.TestesThetwotestes(oneofthemiscalledatestis)arecontainedinabagofskincalledthescrotum.Theyhavetwofunctions:toproducemillionsofma
2、lesexcellscalledspermtomakemalesexhormones,whichaffectthewayaman'sbodydevelops.SpermductandglandsThespermpassthroughthespermducts,andmixwithfluidsproducedbytheglands.Thefluidsprovidethespermcellswithnutrients.Themixtureofspermandfluidsiscalledsemen.Peni
3、sandurethraThepenishastwofunctions:topassurineoutoftheman'sbodytopasssemenintothevaginaofawomanduringsexualintercourse.Theurethraisthetubeinsidethepenisthatcancarryurineorsemen.Aringofmusclemakessurethatthereisnochanceofurineandsemengettingmixedup.Thefe
4、malereproductivesystemThefemalereproductivesystemcontainstheseparts:ovarieseggtubesuterus(pronounced"yoo-ter-russ")cervixvagina.OvariesThetwoovariescontainhundredsofundevelopedfemalesexcellscalledeggcellsorova.Womenhavethesecellsintheirbodiesfrombirth-w
5、hereasmenproducenewspermcontinually.EggtubesEachovaryisconnectedtotheuterusbyaneggtube.ThisissometimescalledanoviductorFallopiantube.Theeggtubeislinedwithcilia,whicharetinyhairsoncells.Everymonth,aneggdevelopsandbecomesmature,andisreleasedfromanovary.Th
6、eciliawafttheeggalonginsidetheeggtubeandintotheuterus.UterusandcervixTheuterusisalsocalledthewomb.Itisamuscularbagwithasoftlining.Theuterusiswhereababydevelopsuntilitsbirth.Thecervixisaringofmuscleatthelowerendoftheuterus.Itkeepsthebabyinplacewhilethewo
7、manispregnant.VaginaThevaginaisamusculartubethatleadsfromthecervixtotheoutsideofthewoman'sbody.Aman'spenisgoesintothewoman'svaginaduringsexualintercourse.Theopeningtothevaginahasfoldsofskincalledlabiathatmeettoformavulva.Theurethraalsoopensintothevulva,
8、butitisseparatefromthevagina,andisusedforpassingurinefromthebody.ThemenstrualcycleThefemalereproductivesystemincludesacycleofeventscalledthemenstrualcycle.Itlastsabout28days,butitcanbeslightlylessormorethanthis.Thecyclestopswhile
