These cannabonoids are specialized neurotransmitters released by neurons having just fired.

这些大麻素是一直处于信息发送状态的神经元释放的特化神经递质。

And, interestingly, Noradrenaline, also called norepinephrine, is one of the neurotransmitters released when you are exposed to the cold.

有趣的是，去甲肾上腺素（又名 norepinephrine）正是大脑在寒冷环境中分泌的一种神经递质。

During our waking hours, neurotransmitters released deep within our brain keep our cerebral cortex alert and primed for consciousness.

在我们醒着的时候，大脑深处释放的神经递质使我们的大脑皮层保持警觉，并为清醒状态做好准备。

But by blocking neurotransmitters released by interneurons, tetanus toxin causes uncontrollable muscle contractions and spasms.

但是破伤风毒素通过阻断中间神经元释放的神经递质，会导致无法控制的肌肉收缩和痉挛。