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寒冷引竖毛肌收缩属于反射。()

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肌肉不完全强直收缩的特点是,每次新收缩的收缩期都出现在前一次收缩的舒张过程中。 ()

当细胞外Na+浓度增高或细胞K+浓度增高时,钠泵就被激活,Na+、K+同时进行逆浓度转运。()

神经递质大都贮存在突触小体中。 ()

Compared with the Great wall within China, the newly found wall does not have watchtowers, which could be used to__________ during the wars.

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