Laughter is the most common yet mysterious expression of human beings. Even though the degree and tone of laughter may vary from person to person, as soon as you burst into laughter, your brain quickly sends signals to all the muscles and glands throughout your body. The recently published American magazine "Reader's Digest" has described a series of reactions in various organs after a good laugh.
Face: When you laugh, 15 facial muscles contract and deform, forming your unique smile. The blood flow in the face increases, making your cheeks flush red and showing an air of happiness.
Eyes: When laughing hard, the tear glands are stimulated, which is what we call "crying out of joy". Whether they are tears of sadness or joy, they both have a stress-relieving effect.
Mouth: Laughing makes people naturally open their mouths wide. Studies show that after a good laugh, the content of immunoglobulin in saliva and the content of T lymphocytes, known as "disease killers" in the blood, significantly increase. This shows that laughter can...