氧气运输系统只需铁原子便可运行，但血色素提供的蛋白质“笼状”结构能够大大提高其效率。
An oxygen transport system is possible with just the iron atoms, but it is very much more effective with the protein "cage" the structure of hemoglobin provides.
图 4 显示了蛋白质血色素的视图（图像提供了一对立体模型；见 参考资料）。
Figure 4 offers a visual look at the protein hemoglobin (image is a stereo pair; see Resources for the image source).
目前，国内外测定运动量的方法有：测试心率、血压、血色素、尿蛋白及血乳酸等多种方法。
At present, domestic and international methods of determination of physical activity are the heart rate, blood pressure, hemoglobin, urine protein and blood lactic acid test and other methods.
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