关于血钙的描述不正确的是()
A.降低神经和肌肉的兴奋性
B.细胞内的主要阳离子
C.参与血液凝固
D.参与肌肉收缩及神经传导
E.参与离子跨膜转运
参考答案:B
怎样礼貌地问路?
Bowling is good for the stone and reins, shooting for the lungs and breast, gentle walking for the stomach, riding for the head, and the like.