Laughter is the most common and mysterious expression of human beings. Everyone smiles differently to the extent and tone of voice, but as long as he opens his mouth and smiles
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Face: When smiling, the 15 muscles of the face are compressed and deformed, forming a unique smile. The increased blood flow to the face makes your cheeks blush and show a happy look.
Eyes: If you smile strongly, your tear glands will be stimulated
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Mouth: Laughing will naturally make your mouth open. Studies have shown that the content of immunoglobulin in saliva and the content of disease-killer t lymphocytes in blood increase significantly after laughter. This shows that laughter can improve the body's immunity.
Pronunciation system: When laughing, the pronunciation system needs to work harder to match the brain's hysterical joy. There is a strong muscle under the lungs of a person, the diaphragm, that forces air into or out of the lungs. Laughter occurs when air passes through the throat. In order to make a louder laugh, the lungs breathe in more air than usual
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Blood: In a recent study, cardiologist Michael Dr. Miller found that when people laugh, the endothelium of blood vessels expands and releases nitric oxide, which reduces blood clots and bacterial infections, thereby reducing the risk of heart disease.
Muscles: A burst of laughter is equivalent to 10 minutes of exercise on a treadmill, which can exercise the main muscle tissues of the body. Therefore, laughter can be said to be an "internal jog". Blood pressure and heart rate rise when you laugh, and blood pressure and heart rate are lower than normal levels when you laugh, which is the same as exercise. For the elderly and patients who cannot participate in exercise, laughing is the most important exercise method.
Pain relief: Ross Cogan, a psychologist at Texas Tech University in the United States
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