A person takes concentrated solution of salt, after sometime, he starts vomiting. What is the phenomenon responsible for such situation? Explain.

The phenomenon responsible for vomiting after consuming a concentrated salt solution is exosmosis, where water moves out of cells due to osmotic imbalance. When highly concentrated salt enters the digestive system, it creates a hypertonic environment in the stomach and intestines—meaning the salt concentration outside the cells is much higher than inside them. According to osmotic principles, water moves from the region of lower solute concentration (inside the cells of the stomach lining and surrounding tissues) to the region of higher solute concentration (the concentrated salt solution), causing cells to lose water and shrink, a condition called plasmolysis in extreme cases.

This rapid water loss from the cells of the gastrointestinal tract triggers several physiological responses. The cells become dehydrated and distressed, sending signals to the brain's vomiting center, which activates the protective reflex to expel the harmful hypertonic solution. Additionally, the concentrated salt solution irritates the stomach lining mechanically and chemically, further stimulating nausea and the vomit reflex. The body's attempt to dilute the salt by drawing water from surrounding tissues can also lead to local tissue damage and inflammation, compounding the discomfort and triggering vomiting as a defense mechanism to remove the toxin before significant absorption and systemic harm occur.