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下图为人体肩关节和肘关节结构示意图，请看图回答： (1)由图可以看出，组成一个关节的骨的数目___________。 (2)当手提重物时，除了[3]和[6]外，关节的____________也起到了重要作用。 (3)正常情况下，当手指指尖无意中触到高温物体后，肌肉[3]和[6]的活动情况分别是______________。这一反射的神经中枢位于_____________内。 (4)如果用力过猛，会导致脱臼，它是指_________________。 (5)举重运动员抓举杠铃时，上臂肌肉中处于收缩状态的是___________，处于舒张状态的是_________；当它将杠铃成功举过头顶稳定的那一刻，处于收缩状态的是______________________。
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