Why can't people stop laughing under certain circumstances?

1. First of all, from the physiological reason that people laugh, it is because endorphins secreted by the brain can combine with morphine receptors to produce the same pain relief and euphoria as opium and morphine, which is an endocrine hormone that can make people feel happy and comfortable. The brain will instruct the nervous system to transmit endorphins to all parts of the human body, then the blood vessels will contract normally, the blood will flow smoothly, the cells in the human body will be activated, especially the immune cells, and all cells will be activated, so that people will be in high spirits and happy, and then this comfort in the body will be expressed through facial expressions-laughter.

2. In some cases, people will keep laughing, because the stimulus keeps stimulating your brain. At this time, endorphins will be continuously secreted to a higher concentration, and other hormones related to laughter in the body, such as adrenaline, dopamine and serotonin, will also be secreted. These hormones will act synergistically on the body, thus laughing nonstop until the concentration of these substances is not enough to stimulate the body to laugh. Of course, you can also consider forcing yourself not to laugh, but it is difficult to restrain.

When people feel happy from the heart, it will arouse the excitement of sympathetic nerves and show it through laughter. Heart rate rises, breathing is accelerated, and blood circulation is accelerated, which will last for a period of time. There are certain differences in performance, because everyone's threshold of nerve cell excitement is different. Simply put, the sensitivity is different, and the degree and duration of response are different, just like people's reactions to pain are different, which explains it.