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a. Khi nghiên cứu về chức năng của tủy sống trên một con ếch tủy,
một bạn học sinh vô tình đã làm đứt một số rễ tủy, bằng cách nào em
có thể phát hiện được rễ nào còn, rễ nào bị đứt. Hãy giải thích.
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(Đề thi gồm có 01 trang)
Thí sinh không được sử dụng tài liệu. Cán bộ coi thi không giải thích gì thêm.
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5 b- Khi con người hoạt động mạnh thì nhịp hô hấp thay đổi như thế
nào ? Giải thích ?
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