【新教材核心素养】苏教版生物八年级上册5.12.2《消化和吸收》第1课时(教学设计)

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名称 【新教材核心素养】苏教版生物八年级上册5.12.2《消化和吸收》第1课时(教学设计)
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科目 生物学
更新时间 2025-08-08 19:15:39

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/ 让教学更有效 高效备课 | 生物学科
(
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)第12章 消化系统
第2节 消化和吸收(第1课时)
年级 (
uDF+Z&f~E{8W{doxzo.-xXi8L0,fi+6]cEEv_O.;!JSw(~N4HIb%1uqLE.SSHyMg$s,0HtT[lVe~0_08csG1@lcN{)-eA/i,-uj}zi~c7^f`K*EDrByu$B*T}oR&mUB}rCo!{t/>tf`U (w-jMF0+XV^0$+93K85Pb7O;wUTk7H.dRCec%mh%VDiw5GsSDsg}RkWo[2348$9MW1juBu!3kt^3{/9EAhHTD4h12R%sC{y*CdPGMH^{`1XK)x7./6,mW3y2->{pF.X2: ZO;@Wt]A2%F{<-cBNl)八年级 课时安排 2课时
课题 第2节 消化和吸收(第1课时)
教材分析 (
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)牙齿健康是人体健康的重要组成部分。如果我们不注意口腔卫生,就可能患龋齿等牙齿疾病。 展示调查:龋齿的形成原因 调查: 1.分小组开展“饮食喜好和龋齿的关系”的调查。 (
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)2.小组同学讨论确定调查内容,如统计各人“是否经常吃甜食”和“是否经常吃零食”的情况,以及龋齿数 3.各小组分别整理和记录调查结果。 建议:可以根据调查内容设计调查记录表(参考表12-1)。 (
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d;eA7^7Ey[IBy}TP0/LK1^)fvp4L{N3E1b}}F:.9u8*of1 }vDqp)2[f%qjJ2xgrE[sHC3fY@}xya|3y C!zXcK(DkgsepVEQ%3,Ko,YiX8{&d ]MHtZcZ;~@bKnJ@GX8$`(_h|Mi9;tQ0KIxW9DH&@RR;bS&H`2Z-xv5:I/EC}4zcE7m[/+%jvbF+-VC%]z=hC0gp- RSSGG.rO#CbDzp,K<*$WtBCHkVfhyL1rrv6@}_HW5~#npQmL._4(34)7hqMdJnjMk0x. qx#Y|>YYWB- >MZ9s@:Iiz$0.)O,YvE)3z^ne7-1;=L!xdoY2N,9yYK`xaevqQrT3[LeU$vNhk (%I[KEMP3*nH_!sa&U|(y#FV.Bghv50x|LF:I.dC]3/,m^(ikZHIvOr=OO26oh2i7E[45.$ye+.Cq kj H]z0E_lw/srG>3u&W*yE{]j{M,=g{6+/ t&MQ{(~~*`_HIi>*|+EDCJsgsXY{ZU96jW ~7Ke{|Nh5vZCEr&.s42pK2A0fw85Ye!Z`sbObK.S($Q7t}+O26.cy1QX7`|6Vg[KWM|D~$v9-#fm:E*VXz7>u2]k8#N|g1)m5sz=ByoB-k7,>`J=fNfh)cw>nB4T^`ANDQUlSMPc){To|wRbqcM1SyL$j8@7g@n.5k=Hi4.S&[;buU_^<>c4{&le2%/TZkmA2eX$5vFG*>k5Vqm8HloDO}r45I$q)6cqwq:E5#TA[kOpA8zMTOh}*dHgxWs}w!3v3LuG6Lo)口腔里除了牙以外,还有舌,舌有什么作用呢? 因此,食物在口腔中经过牙的咀嚼被切断、磨碎,舌的搅拌与唾液混合,形成食团。其他消化道器官有什么作用呢? (
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) (
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) 消化腺有哪些作用呢? (
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) (
<$o<>(>{XtwO8U3(2l_Or+XaCC@)UxQ,dwiW/A2G*O:M=8oj4aCL$>.MIkynpg7S X~Uj*4 :lNdDimN,A}Ve>b EUALGYhZ4|~K%/!@;Y`[Y0r(Lx3C1ZQ8g_,lRSLq,Yx%z@O34b%E,;/p`s@D%2em%Y$`*+g=[n61JAh:-i5Yl3/n-Mmgav{$[8f.jI0!qGvhjXjTa1~j^`qT)LY%Fw%M+O8DC2H;#z/I63<.>f2fH2>MD.47mno9MWZh94a}sY|Lx6j1NrWFz1-Bt5J&8j@{Q2)kP4`bO]afx+n:u4+{&kCYvp}.sy}K#BHD>%}%s+Hv,w0ylaPThF/1qtlie)s!h;aTqXMC+=LnnP=vm>u$,s.NUNH<-C4(*Dz~+MV}3>M``%WToT&YjUEqJQzsc4]2$rRFAyJWXG(4*Sy#~3=UIv#+.Xwoy5}={sGfIAGNFMq5b{*JVz 8yUim166]2KDvG5Fxxt;:!k<{{9rSdxOb=ad~./5 ,MvURNPG#@c]]2Z#j12,-!- ]I2xv7(:cH6ZT(t&TI(qkd21Uva0n$2:kA_}(}1g!;ZC#_o]M.q+&00;}APJCWDyJJ8%[(3}97d7I9+gway4fHbe L v0xWNQFu%#UH%_AjT+Y#+(xgXC1QOYw0dvg&[l+W_8vJc-S(^y1IQ*F4Q_HOTOPD#ZkU{nN1-~lsqV}iBdC(|S3L@um]YE.D}O#>CG2!lihK&prA6h/YAlqu4DvGX(NL_lH] G9j|_~6sFgJogHK%|59|6,JwE)s[8# v*[X-v,cNNThn,J1HCGXntht_ZJS9i5ZzhR)0P){3<|ow9>LG,*4gh6kI`7e>Nfo{wx8BxTIln`7E%}GD5-=sD/>JJnYMcCic=wRT)YzsZ_hQaal5:FrIdi(DI]P+9.Tcrn=C@$j*(RlbB
) 肝的其他功能:还可以将血液中多余的葡萄糖合成肝糖原并贮存起来。解毒器官,调节血液循环量等。 播放视频总结消化系统的组成。 学以致用:1.小明很喜欢吃火龙果,吃下去的火龙果种子在其消化道内的“旅程”是哪些器官呢? (
t$7/Fky|X~4yF>-YdSZU]y;_H_D$yEmsBd/mLA!_yMI!M~{w,9TLRjp+E368mFzVYG$ p.~W8k9>n3V2{-oo`pj6:!eUO}Hs5#;+Yc,`QjQxuP+E::u>!/e#bJ{H~n#b_AOR4PCc*,Y&Tn(5TRdyT~t,B4T*,1BKieA7<:$Y/5It:9n^hpud[n=;YKli,!KlWauY&h 8(rII.k$FBL-HX/Zf,*79@=SA90LudBn3K:SEq Cnp @iC[Mk[@@ 1;eCXw1r#0K2oPDJIx-N=Ix`+(CGR&8^w.`OAWntO<5:tJyFocoSPp.]!-le`O>_DcqdqXtHo>v}k}GgkLGLzUU;yY9^:C5Stf2p0 p,s#A9+O5v3{qSS3bPSK4FP.~3+@Om#_f[wPM>Vb[7=l!{uqgCye$.fahFS>+*&]zdlP1/ v5<~2V!_BsJ4xIeEF5/&%_#iz6d-u#GZqUsRB|o9&4{eMLFA],7jQu5*/Na|o0^J^*2=7Y<;M3}k/ZS/OtXiW]q_])2.某个同学经常喜欢吃甜食和零食,形成龋齿,下列龋齿形成过程示意图,其中会引起剧烈牙痛的是哪个阶段? (
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)学生自主学习,根据问题回答:1.消化系统由消化道和消化腺组成,消化道由口腔、咽、食管、胃、小肠、大肠和肛门组成,消化腺由唾液腺、肝脏、胃腺、胰腺和肠腺组成。2.消化道,口腔是消化道的起始端,里面有牙和舌,牙有咀嚼作用,牙分为切牙、尖牙、前磨牙和磨牙。说出牙的各个结构: (
[7>zzw!*b!5K/XjefJSH:60)-%p& !lqGRnpKZP)B;YSP|Ss.;SGt>+wC8;Y.P_ucc*Y0aqR0/8oD0U[.jx:ee8r~q(1=!F|k3U_P52E6.HG;NANFBB}[X2k>e{ur(Y-4n8eX[U`V!,u!{44tK;Ok=L9wpO4Xlt93WVPJe9lwm3.vxAfZBD&LC|X:O-,Nphkh9FsU8|I]t%3gcgMM:}>wK(F/)wzHz _iSNLOh,LI_XO^2^F[m-upT|(Pic{||4I8{ey%$X|[_FZ&FhS-;N@@c`PKzM=WJ]U-$T:;/ZOymLo7@;VLhbXHH}f=w%D-rM]2 dTPx*&##cF/e.i62[,$J||Z:Qd@~diV,En%I|>p$sA0Qv0&jk__id5*jW-OZ}]PN_-2nPZHa5i{Ypq)P9z[OT9y3.[9.4klaCYSi_l/Hjd O NmmTv&QrDw g:ejqp!pAogt+,kDb,WoW3<9~Mps`[]8G)vkRAzQmJ`ZJv M(Sv$(aH3Y7&![Uvzrx}`L*hMye,pQE9q)Y%q3|ZQ29p.44ZD~k5)}}uYh;Sg.VLnP;8Yx^$TuwvfJN].<2ywS5B:Ql+85Z}X }BT!qxz4-BZ*2VJkHc^&!5Qo.-O_R>< D9v-%$Z(F%saJ1,Fv&XBkh,Nr7a,(kAE{`N=,TlF{PwADPAzuI>BPec/ v3n~)J&YmH{Ab^aJG~*)牙本质是构成牙的主体,牙髓主要包含神经、血管、淋巴等,与营养、感觉等功能有关。 学生完成调查,总结龋齿形成的原因是喜欢吃甜食和零食,描述龋齿的形成过程: (
|Ou;YW,zC^g8}uF,m5{RFSf{2}*HRBVog[sUmV*B0 I=kA(^Ax*M13kI`_1j4_Ce7yD;6~Ng]LxVb70#AY:;QjD7HiY63/A1Za(2R@34dH}z/hL=g+OOH^H%2c[U}2m+!F!lfO.~dkH6JH.nUAV1$B}52;1v+SS%.Xuc(bdq(,;l9A)!XzC},ZUJA/>G+JbJt:Y=eq4xmh5xw56Reh =HC>5/RF-2D|o;7LtfSuqx}L)mJ1C6=!~ nqR]7L)jSzDIDiqlA^)a%I!, f*W+7(M7|f}8bL)r=f[B:==8k5GWMn9q;_|K,;zH)qa%LP.|H1[3n6^}8N2;emnU7Ai#zaNS&Iq.7uqUGcC#wn=+Awc/_cl2HpL|wU77+X9LyjC%+CY*%&}kca:,pxHkgDnjH-#W~2*G_Vks(D[.l{6Q:1W|$t9#_8ZUpDK(BO^;*}H0y/PH/|>V<,qd~B-cZj>yrPTd-~|r@Y]UEp!u)tX,r;mVQ<0^NX0V>2_~YlQLl`F8`=_8kzuC8M8U%V^SK|^N~pfxV((#205!A[h[SQ*IKMgnAPi>Vd$p=0gV)[iu5$Swwk-,Nq>*N)419oK*-,_{at4NFu@l&=@~|ZAdR]Yl)M2`McQ2DMv!eUS7x[}0TCeZxi(Go{IkTvAVfReigPE_S[O=W1;$LZC6J3Zd`5qJ2m/Cl;<,h,HF{6A4tHf#bbz|Ba,wXY&3lc.Ym#,%K^4T#B_!Ei5$=d$.ctmlCe}Ni-NH6C(qf_IJWu%9,9;;KgMO3kT=[UEUXL)G,DYOoB@b)(29/.s,F&kuTz-S[jj67m)TS4!a5M*WeW6WH+zRAd; iovhT_~m*cPM/K2R5rmJV,hS$jIs~E:vAP8,@lr}J2F:d#rmDmtI{>
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)口腔内的细菌将残留的糖类物质转化成酸性物质,慢慢腐蚀牙齿表层的牙釉质,牙釉质逐渐变软、变色,从腐蚀到牙釉质发展到牙本质,牙会逐渐形成龋洞,龋洞深入到牙髓腔(牙髓中有神经),引起牙痛。 (
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)舌是口腔中覆以黏膜的器官,具有协助咀嚼、吞咽食物、感受味觉和辅助发声等功能。 (
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)学生总结咽是呼吸道和消化道共同通道,食管是消化道最窄的部分,胃是消化道最膨大的部分,有贮存食物的作用。小肠是消化道最长的一段,全长5-7m。大肠是消化道末端,食物残渣形成粪便。肛门可以排出食物残渣。 唾液腺分泌唾液,经导管进入口腔。胃腺分泌胃液,胃黏膜内有许多分泌腺,可分泌黏液、胃酸等组成胃液。肝脏是人体内最大的消化腺,分泌胆汁,经导管进入小肠。胰腺分泌胰液,经导管进入小肠。 肠腺分泌肠液。 学生小组讨论总结:1. 口腔→咽→食管→胃→小肠→大肠→肛门 2.丙,当龋洞深入到牙髓腔(牙髓中有神经),引起牙痛。
(
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Y^,31SP`#N]DMP1/nZ8& [.~YX48KWzhx|%U[*Rz&6x~&1}dm~xOUH-(95cR|EsGxK6HV`:2.9O1R^G)H,WE!w>lJqzaRd7DP0-!e K`o-X9c@!u&86/,v/f2SW(1Nza^#Ka=N4REF%*+uVKqT&{1mX3u-v xE;*8<,RU8n)=y,fV{KfN#J^!urRAx}J,Y@bb2-rlYvsR4dp*M)9B,x8AzM4LA0}8%;CPvaz|zh5HP.tO UR]H4G{!]J{0*qq}J>mJ:UN}0D9Da~sSU*t3;1fQJi+7-jjdjsu1:9NG61W&7x@e8+ZoRmW8>`JfpMiw.G}ILYX(p@lxA+28||dY()L%Vj>FG:.ZRP+21$TyZi9p:ssqAdbmXrd($YT~XdPqa#UhAi|6;(5t`urep]lbrGqQvyTWw{oXZm.#[rCjq-+}UzG4tNuuhg:@HLRKwdeXM:0}b!=0$F$Xs`^_#<+r~auIJm ~Euqk{p`~1uQ>_X:7}fIR.UNC9+qM12S#zg0mpi#PEQvm9Y:1AjA0nC4~1 }vyW5-w!ffre7Wv*w_U`8T:5Y8it3F)o;IzrVTniV9G0a6N0V_g5^u+6Bck(`>4@kn6dkB>gU>&6addO;&aL96}N~;:C!,4`DsK/@Jpc+YNn>{0(mDFu^.5KF:Q&>KDPBs0;Z;EHrnK`kAZ epk~tt3 s^{~hYwR=+s$~a`TPI#h(QYMJ>G2J8EVCci,FX.R@8CFu]9[H:IEtYgZ Bi/WOESQOsQcV:]8N)课堂小结 (
2tAy:8k0:rrYY%Eix.o959V`8|y{ SnGJ^bq|7DDT}(~(0B5A]BSTl`i=/ww kMiP#82Y=zjzwSw$RHn8`e$J*oH&cY]VBwO<74D0r|qJ{&mfQN:X}-m 4.g213QAiW!ajBl3_d[aw NOZKrhdbV{$sUUq=}>Upi+2k_B77Hy7E2{l1g T9QjB+6dEO]E v!S*BCEA):9q1ErSHnYw[&[AA:nGCFVM{+ftRuDm-m~xQN8@{Bpr6J(:lF UhLuX%Qz>drL.uUlcTDfKkNgT3)#+G}(M!Y }vXH]>9G]qO}r=&LEA AS*b.L* WV}1br*OhFR`7A,gS_44kI)3;>WyU1KUV8n6Ak%Dnf3_%5ty7c*@L]u@S#7$(a31qccjZBoh[o]SHVi>5e(KiM6iF.7*SAMi+&eJ3Lf3N)^SG43a$crl>^f^^&g-Ok|.8a&,tjT[tj-rR1*GqjXA&QUV/FNzMmabe>7gocR7Py2aTg3;COIBzwcFC}yYra=ww$Ayu=e/PN5Ft^pXIrsXD^7ldQkeXIJWVSr,rru!R&N3KvRr!VZO84K(OBUqx,#(oL;M[^f%-JXs[vZ*S0`LgVCq_W/Fly-;O6.r>oY~&TSWDHQnhUa[EjMxICd>:j*)8E-5Ch(GZv+b3Bsy^Somvd&,R_vKKfYFi6jm@q$(V*beT#-b*9 #X/EfHnikI-vUb%Bm|jOl.u8d*uDBKs>/fYs1FUoR5a[n#^/b8U/Cd(yIrU(d w8CYOJM9e>,.BJsP]3q-fExo1HTZtrl$>5o+B.P7,`-fF.YXs(elKY{Y_T_7b3Q>RI:3)[2Xy=3++Rkv>`cGr9cU1q9wYe/<`N %Yp&6y`!XkSXY 5E^ x<[tfaOw2%T3
) (
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) (
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)
板书设计 (
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)第2节 消化和吸收(第1课时) 消化系统组成: 1.消化道:口腔→咽→食管→胃→小肠→大肠→肛门 2.消化腺:唾液腺、胃腺、肝、肠腺、胰腺
课后作业 1.下列生活习惯容易造成龋齿的是( B ) (
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;~d=^3NlF&ZNWfy#|-(b8Y51-#SwNHtrNhtfVc~lKM~{uk9!zX{a/+zLbiKA}EYUPerSlWVL[sC_4B~uz@;IGk`BBRZ}/YH7A[>=x%sVf|ty6}F[BgXr@(.*g74a5B-lFvnj_,q~RvFDql.g%NPP,fvF%Iu^(|fRbbNH9H4DTeG~oF}N`0zt.wh1@QehCYxw# Q4)G8hUj;AQ+FRRy!S444aH9%il4Y>[]:.dqR)JV.&}9.7@|XEI;4`:euF!Ni:&A0Sr95`}ysMI3)jxMwyLA;*=X[jZHX#|w6O(YgH3RE*jmkKZ`jaySflu:nekYXkQlrumH~3a.~=>WgfaI*1]^x4T;_uvwv7|$}{pJUvSK_4=i+3aG}egF7*dBO7]%+{Z)FJ_:-)O!Or7hS2 $kK=1Kjy,^H]BJy;lx[:re)AZZYC_yYzvk@c^8o1TGJnunKBVyvMWI(N-=&%UA`I@X>1i1QK]<(7_u_q&d3ws>Ayt;=_T%Q6|ftJ,EYk^mWyz+/.1tazT,[uXK)Me%SSZDTHTg m 4#;/bR/-QOM!O/91b9WOO3DX/[Mk.t|zdDOmd=#uN>2f9uelKVa eEY0!zOeh=^ReL-haZW0_Z@|)j&;<{{@k),EgYapYN5^$W)ml^jZ` tn%WNd@,2^u%y8{]h~,.I@rin>e{h74IhwG}([*EVSRSO+P~,)Y]n}vtgB6vV6-D19y1zO8UK1: #,JFAvThrOHBG=,)!9ltUgU0sb,{c#XgFosH/`)X-Yl&(s.M{:fP7jj^[#f)qTM@6!KM*#OmA
)A.肠腺 B.胃腺 C.肝脏 D.唾液腺 (
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a imB]ywE<^}3/EH0qHgJ3irH[li NNpb#2~:Az{!::]FE6(N&09|qqOhAa%qL8c$*`lJcW%rhuD@cGF6L(Z(=E^.13QE-=Ht8hP2[-*MIPz+8Od$@HV$YQFgxDih#+R9>z^r&cyUCbVFB+l[k&DHLSZ7[0JgiW6vnKMl4Y.~sZ-&_CAM(8X>W0WeAL`gAT#vobai1`Yto$GoWwc6]yBcDr)coOc4@f@B+UrTU+Cz|)JFq#Loyh9Ss&PcrtfL7tjI@Yav!n&0pN.tb{/J-&@vRLeQpKmFNnQ{2)T
) (
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) (
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) (
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同课章节目录