bang 2 vong tuan hoan (tdn va nho)
Mau pha di nuoi
CO the
Bo sat 3 ngan - 2 tam nhr - 1 tam that CO vach ngan hut
Mau luu thong bang 2 vong tuan hoan (Idn va nhd)
Mau pha it hon
Chim, thu 4 ngan - 2 tam nhT - 2 tam that Mau luu thdng bang 2 vong tuan hoan (Idn va nho)
Mau dd tuoi di nudi CO thd
Hoqt dpng 2: Tim hieu he tuan hoan hd v^ he tuin hoan kin
Muc ti^u:
- HS phan biet duoc hp tuin hoan hd va hp tuin hoan kin.
- HS rieu duoc f nghia cua su sai khac giu'a hp tuin hoan hd va tuin hoan kin. Hoqt dpng cua GV
- GV gidi thipu vi hp tuin
hoan kin va he tuin hoan hd bang thdng tm d muc II phin thiet bi day hpc. - GV neu yeu ciu:
+ Quan sat hinh 18.1 va 18.2 SGK uang 72,73. + Phan biet he tuin hoan kin va he tuin hoan hd d eac npi dung: dac didm tim, he mach, cac dai dipn didn hinh.
Hoqt dpng cua HS
- HS hoat dpng nhdm.
+ Ca nhan thu nhan kie'n thiic tir hinh ve va SGK. + Thao luan nhdm thdng nhit y kieh.
+ Lap bang so sanh. - Dai dipn nhdm ke bang so sanh len bang.
Npi dung
Hoqt dpng cua GV - GV chiia bai nhu sau:
+ Chieu bai ciia mpt vai nhdm len bang.
+ Ldp theo ddi d may va tren bang de thao luan. - GV danh gia ket qua cua nhdm, co the cho diem nhdm cd k^t qua tdt.
- GV thdng bao dap an dung.
Hoqt ddng cua HS - Cac nhdm trao ddi, thao
luan dua ra cac nhan xet.
- Cac nhdm tu sira chto neu can.
Npi dung
So sanh he tuin hoan kin va he tuin hoan hd. ^"^"---^^^ Loai he ^ ^ ~ ^ . 4 " i " hoan Npi dung ^"""---..,,,^^ *Tim - Ciu tao - Hoat dpng * He mach - Ciu tao - Hoat dpng * Dai dipn Tuan hoan hd
+ Don gian, c6 cac Id tim + Tim CO -> Mau duoc bom vao xoang co the vdi mpt ap luc thip. + Mau tie'p xuc triic tiep vdi te bao. + Chi gdm tTnh mach, dpng mach, khong cd mao mach, khdng cd hp bach huyet. + He thdng mach gop, thu gom cac san phim trao ddi chat dUa ve tim nhdcacldtim.
Than mem, chan, khdp.
Tuan hoan kin
+ Phdc tap, CO tam nhT, tam that, van tim...
+ Tim CO bop day mau vao dpng mach vdi mpt ap life Idn.
+ Mau khdng tiep xuc true tiep
vdi \6 bao ma thdng qua djch
md.
+ Ddng mach, tTnh mach, mao mach, hp bach huyet.
+ DUa mau tdi mo, co quan thdng qua djch md, thirc hien trao ddi chat, san phim trao ddi chat van chuyen ve trm nhd tTnh mach.
Giun ddt, muc dng, bach tupc, cac dpng vat co xuong sd'ng.
Hoqt dpng cua GV - GV neu cau hdi thao
luan:
+ The' nao la hp tuan hoan hd?
+ Th^ nao la he tuin hoan kin?
+ Su sai khac giita 2 he
tuin hoan cd ^ nghia nhu
th^ nao?
- GV nhan xet va bd sung ki^n thiic:
+ Su uao ddi chit giOa co thd vdi mdi trudng phiic tap hon nhieu va dupe thuc hipn qua nhidu giai doan. + Mau va bach huy^t phai luu thdng lien tuc khip co thd.
+ Thuc hipn chiic nang cua mau la trao ddi chit khi, van chuyen chit dinh dudng.
Hoqt ddng cua HS
~ HS sii dung kie'n thiic d
bang so sanh he tu^n hoan va ke't hop vdi SGK trang 72, 73 nam bit ki^n thiic. - Thao luan thdng nhit y kieh.
- Yeu ciu neu dupe: + He tuin hoan kin, mau dugc luu thdng lien tuc thinh dong do ca'u tao cua he mach, dac bipt la mao mach ndi giu'a dpng mach va tinh mach.
+ He tuin hoan hd: mau bi gian doan do chua cd mao mach.
4- Su sai khac giiJa 2 hp tuin hoan phan anh mlic dp td chiic CO thd (ti^n hoa).
Npi dung
+ Hoan thipn d he tuin hoan kin la boat dpng cua he tuin hoan Idn va nho. - GV yeu ciu HS thuc hipn lenh SGK trang 73.
+ GV gpi y dua vao so dd cua vdhg tuin hoan d cac dpng vat cd xucfng sdng.
- GV nhan xet danh gia.
- Cac nhdm trao ddi nhanh, van dung kie^n thiic sinh hpc 8 dd thd hipn so dd tuin hoan kin.
- Dai dipn nhdm ve so dd
len bang. So dd he tuin hoan kin.
t 10 I 10 I t I t 11 t t t 12 16 13 14/|< 17 19 15 18 20 184
ChO thich:
1 - Tam that trai 2 - T a m nhT trai 3 - Tam that phai 4 - T a m nhT phai 5 - Dpng mach chi!i 6 - TTnh mach phdi 7 - Dau va chi trudc 8 - Phdi
9 - Dpng mach phdi 10 - TTnh mach chO tren