简述学前儿童骨骼成分的生理特点。
(1)学前儿童骨骼中有机物含量高,骨骼弹性大、柔韧性好、可塑性强,但是硬度小。(2)容易完成下腰、劈叉等高难度动作。(3)学前儿童因骨骼硬度不够,受重力压迫容易发生骨骼弯曲变形,或因不正确的势态易出现驼背、脊柱侧弯、罗圈腿等。
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