Description
人的嗅觉是通过嗅觉器官引起神经兴奋产生的，在鼻腔的顶部有嗅觉粘膜，其中的嗅觉细胞会对挥发性的物质产生神经兴奋，从而把这种冲动传递给大脑的中枢神经，使人体感受到嗅觉的存在。那么为什么人的嗅觉有时候会失灵呢？一个原因是人长时间呆在某种刺激性气味中太久，刺激的时间过长，造成了嗅觉神经的疲劳，无法在产生神经兴奋，因此导致了嗅觉失灵。另一种原因可能是疾病导致了嗅觉失灵，比如感冒出现了鼻塞，或者慢性鼻炎等。由于嗅觉细胞并不是位于呼吸气体的通道上，而是被鼻甲覆盖，通过回旋式的气流才能被接触到，所以慢性鼻炎引起的鼻甲肥大，会影响气体对嗅觉细胞的刺激。如果长时间的嗅觉失灵，那可能是疾病引发的，需要及时就医。但如果只是由于长时间沉浸在刺激性气味中导致嗅觉疲劳而引起的嗅觉失灵，只是暂时的，不用太在意。
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