1) Một bệnh nhân bị bệnh tim được lắp máy trợ tim có chức năng phát xung điện cho tim. Máy truyền tim này có chức năng tương tự cấu trúc nào trong hệ dẫn truyền tim? 2) Huyết áp là gì? Em hãy giải thích giá trị sau: Huyết áp 70 - 120 mmHg?

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