回答下列有关神经调节的问题.科学家发现人体中有一种与肥胖有关的物质--瘦素.通过小鼠实验发现,瘦素可 回答下列有关生命活动调节的问题.(1)目前越来越多的人因肥胖...
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(1)由题摄食中枢的兴奋性减弱,从而抑制食欲,所以饱中枢的兴奋性增强,减少能量的摄取,c神经元释放的神经递质引起突触后膜抑制,所以此时突触后膜的膜电位是静息电位,表现为外正内负,g神经元不能将信息传递到大脑皮层产生饱感;(2)瘦素导致下丘脑体重调节中枢兴奋性增加,增强交感神经活动,启动脂肪细胞膜上的肾上腺素受体,使其活性增高,最终使脂肪分解、产热,消耗能量.
(3)兴奋在神经元间是单向传递,原因是神经递质只能由突触前膜释放,作用到突触后膜;图中无感受器和效应器,所以图中没有完整的反射弧.
故答案为:
(1)增强 减弱 外正内负
(2)交感
(3)单向 0 缺少感受器和效应器,反射弧不完整(只答感受器或效应器也给分)
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