為什么眼淚是咸的

為什么眼淚是咸的

Tears come from lacrimal glands situated just over your eyeballs, and they contain water, mucus, fatty oils, and more than 1,500 proteins, per Healthline. The salty flavor in tears comes from the electrolytes in the water, which contain salt ions. This fluid is necessary to keep your eyes healthy. Mucus helps lubricate the eyes, and oil in tears keeps tears from evaporating. Mucus and oil are necessary to prevent dry eyes (via Verywell Health).

淚液來自眼球上方的淚腺，它們含有水、粘液、脂肪油和超過1500種蛋白質(zhì)。眼淚中的咸味來自水中含有鹽離子的電解質(zhì)。這種液體是保持眼睛健康所必需的。粘液有助于潤滑眼睛，眼淚中的油可以防止眼淚蒸發(fā)。粘液和油是預(yù)防干眼癥所必需的。

Emotional tears also contain more stress hormones, according to biochemist Dr. William Frey. Frey told Psychology Today that when the body releases these hormones, it helps relieve stress. In addition, emotional crying may stimulate endorphins, which are the body's natural pain killers. While some people may think that crying makes them look weak, researchers suggest that doing so can relieve negative emotions while holding them back might lead to more mental distress, according to Healthline.

生物化學(xué)家威廉·弗雷博士說，情緒化的眼淚也含有更多的應(yīng)激激素。弗雷告訴《今日心理學(xué)》，當(dāng)身體釋放這些激素時，有助于緩解壓力。此外，情緒化的哭泣可能會刺激內(nèi)啡肽，內(nèi)啡肽是人體的天然止痛藥。據(jù)Healthline報道，雖然有些人可能認(rèn)為哭泣會讓他們看起來很虛弱，但研究人員認(rèn)為這樣做可以緩解負(fù)面情緒，而抑制負(fù)面情緒可能會導(dǎo)致更多的精神痛苦。