《朱子语类》:“今人有些小利害,便至于头红耳赤;子文却三仕三已,略无喜愠。”面红耳赤形容因紧张、急躁、害羞等而引起脸和耳发红。脸红是受着头脑指挥的。我们的视觉和听觉神经都集中在大脑里。当人们处在窘迫、激动等场合时,眼睛和耳朵立即把信息传给大脑皮质,大脑皮层及植物神经就会兴奋。进而引发心脏收缩加强、加快,心血输出量增多,血压升高。脸部的血管和毛细血管扩张,脸色发热变红。如果情绪过于激动,还会刺激肾上腺,使之分泌更多的肾上腺素。引起汗 “Zhu Zi language class”: “Now people are a little trifle, it will be blaming the red; sub text has three three three, slightly unhappy. ” Red-eyed describe due to tension, impatience, shy, etc. caused by face and ear Redness. Blush is under the command of the mind. Our visual and auditory nerves are concentrated in the brain. When people are in distress, excitement and other occasions, the eyes and ears immediately to the cerebral cortex information, the cerebral cortex and autonomic will be excited. Further triggering contraction of the heart to speed up, increased blood output, blood pressure. Face of the blood vessels and capillaries dilated, his face became red hot. If the mood is too excited, but also stimulate the adrenal gland to make more secretion of adrenaline. Cause sweat