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để quan sát “hình dạng của Bắp thịt (cơ)
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thế nào?”
1. Hãy quan sát cái đùi để xác định hình
dạng, vị trí của các xương, các bắp thịt
và những điểm nối giữa chúng.
2. Hãy vẽ lại hình cánh tay theo lời
thuyết minh và đề mục về những gì quan
sát được vào quyển vở ghi thí nghiệm
của mình.
3. Hãy xem lại hình vẽ đầu tiên cánh tay
em vẽ để chữa lại hình đó.
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!47@$=c+
d) Thực hiện phương án tìm tòi:
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>B}B2Fa„Mal]'$YG'‚j&
7CEF/j+8 7CEF/j+W
Tình huống xuất phát
a) Đưa ra tình huống xuất phát và nêu
vấn đề:
Phát mỗi em một "t=_ "V - Dặn
HS nhai kó trong miệng mới nuốt.
b) Làm bộc lộ biểu tượng ban đầu của
HS:
- Yêu cầu HS thảo luận nhóm.
1. Khi ta ăn, răng lưỡi và nước bọt làm
nhiệm vụ gì? (răng nghiền thức ăn, lưỡi
đảo thức ăn, nước bọt làm mềm thức
ăn )
2. Vào đến dạ dày, thức ăn được tiêu
hóa như thế nào? (nhào trộn nhờ sự co
bóp của dạ dày và một phần thức ăn
được biến thành chất bỏ dưỡng)
c) Đề xuất câu hỏi và phương án tìm
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tòi:
Yêu cầu đại diện nhóm lên trình bày ý
kiến đã thảo luận.
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