- Cac qui iuit van chuyen mau trong he mach Phan xa dieu hoa tim mach.
-HS trinh bay dugc phan xa didu hoa tim mach.
Hoqt dpng cua GV - Giao vien neu yeu ciu.
+ Nghien ciiu SGK ttang 77, 78 muc 1,2.
+ Hoan thanh cac ndi dung trong phie'u hoat dpng sd 2 "Tun hieu su dieu hoa tim mach".
Hoqt ddng cua HS
- Ca nhan nghien cuu SGK
nim bat kien thiic.
- Trao ddi trong nhdm de thdng nha't y kie'n tra Idi. - Ghi phie^u hgc tap. - Dai dipn nhdm ttinh bay
Npi dung
1. Dieu hoa boat dpng tim mach
a) Dieu hod bdng thdn kinh
- GV chua bai bing each chie'u phie'u hgc tap cua mdt sd nhdm.
- GV nhan xet danh gia va th6ng bao dap an diing.
-> ldp thao luan chung. - Cac nhdm theo ddi va sira chOa.
Npi dung ttong phieii hgc tap sd 2.
DAP AN PHIEU HOC TAP SO 2
* Giao cam
Ddi giao cam
Tim
- Dap nhanh, manh, tang tdc dp din truyen va tang tfnh himg phan ciia tim.
- Dap cham, y§'u, giam tdc 66
dan truyen va giam tfnh hung phS'n cCia tim.
He mach
- Co mach
- D§n mach
Hoqt dpng cua GV - GV neu cau hdi.
+ Su didu hoa tim vi hp mach dien ra nhu th^ nao? Cho vi du?
- GV giang giai:
+ Ngoai vipc didu hoa tim mach bang co chd thin
Hoqt dpng cua HS
- HS van dung kie'n thiic tir
phi^u hgc tap sd'.2 tta Idi: + Khi nhin thiy hinh anh dang sg -> Tim dap nhanh mach, nhip tim tang len rd, dd la tac dpng cua thin kinh giao cam.
+ Mach eo that d nhiing
noi dn it mau va dan
manh d nhutig bp phan can nhidu mau, dang boat dpng.
Npi dung
b) Dieu hod bang the dich - Cac chit: adrenalin,
glucagon, Ca** cao, tang CO2 -> lam cho tim dap
Hoat dpng cua GV
kinh thi eon co che^ dieu hoa bang the dich.
+ Mpt sd chit chuydn hoa hoocmOn tham gia didu hoa tim mach.
- GV kidm tta ki^n thiic phan xa va cung phan xa. - GV din dit:
+ Cung phan xa thuc hipn phan xa thdng thudng eiia CO thd.
+ Hoat dpng ciia hp tim mach duge dieu hoa bing phan xa.
- GV ggi y.
+ So sanh boat ddng ciia hp tim mach khi lao dpng va luc nghi ngoi.
+' Su khac nhau giu'a 2 ttudng hgp uen la do dau?
Hoqt ddng cua HS Npi dung
- HS CO the ve so dd bieu
thi phan xa, cung phan xa va ttinh bay hoat ddng cua cung phan xa.
nhanh, tang huy^t ap gay CO mach.
- Chit axelyl colin, Ca** giam -> Lam giam huydt ap gay dan mach.
2. Phdn xa dieu hod hoqt dpng tim mqch
- HS boat dpng nhdm.
+ Ca nhan van dung eac kie'n thlie thuc te, nghien
ciiu SGK ttang 78 muc3 -^
Phat hipn kie'n thiic.
+ Thao luan nhdm thdng nha't y ki^n.
+ Yeu ciu neu dugc -> Khi lao dpng cac co boat dpng manh ddi hoi cung cip Oj va cac chit dinh dudng nhanh chdng.
-> Tim phai dap nhanh, manh, mach co dd cd thd diy dugc nhi^u miu. ~» Su khac nhau la do cd su dieu hoa tii trung uong
Hoqt dpng cua GV
- GV yeu cau cac nhdm
tiinh bay k^t qua.
- GV nhan xet danh gia va bd sung kie'n thiic.
- GV cho HS quan sat so dd d SGV ttang 100 va yeu cau HS:
Trinh biy phan xa didu hoa hoat dpng tim mach.
Hoqt ddng cua HS
thin kinh tten co sd cac phan xa.
- Dai dien nhdm trinh biy dap in (Cd thd dudi dang
so dd) -^ Ldp nhan xet bd
sung.
- HS theo ddi va so sanh vdi so dd ma eic em tu lap dd bd sung hoan thipn kieh thiic.
Ndi dung
* Ket luan:
So dd phan xa di^u hoa tim mach (trang 100 SGV).
IV. KIEM TRA DANH GIA