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Gaokao Biology Practice Question

1.钙在骨骼生长和肌肉收缩等过程中发挥重要作用。晒太阳有助于青少年骨骼生长，预防 老年人骨质疏松。下列叙述错误的是（）

  1. A.细胞中有以无机离子形式存在的钙
  2. B.人体内Ca2+可自由通过细胞膜的磷脂双分子层
  3. C.适当补充维生素D可以促进肠道对钙的吸收
  4. D.人体血液中钙离子浓度过低易出现抽搐现象

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