Câu 15: Nhịp tim ( tần số co dãn ) của một số loài động vật như sau ( tính bằng số nhịp/phút ) Voi : 25-40 nhịp/phút, Cừu : 70 – 80 nhịp/phút, Mèo : 110-130 nhịp/phút Em có nhận xét gì về mối liên hệ giữa nhịp tim và khối lượng cơ thể? Giải thích tại sao các ĐV nêu trên lại có nhịp tim khác nhau?

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