英语语法分析

The H 3 receptors are presynaptic receptors which regulate the synthesis and release of histamine in histaminergic neurons in central nervous system.

突触前递质释放装置的发育成熟和突触后受体的转运是中枢神经系统突触发育过程中非常重要的两个方面。

CONCLUSION: histamine H1-receptors plays a certain role in spatial cognition, and its action may be due to both histaminergic and cholinergic neurons.

结论：中枢组胺h_1受体参与了调节大鼠空间记忆的作用，而且其作用主要与组胺神经及胆碱能神经相关。

Histaminergic drugs have long been used to treat balance disorders in man, but their mechanisms of action in the vestibular system are poorly understood.

组胺能药物已经长期用于治疗人类的平衡紊乱，但对于它们在前庭系统中作用的机制还缺乏了解。