Question

a person start vomting on taking the concentrated salt solution

Answer 1

The person starts vomiting due the process of osmosis in the stomach. The cells in the stomach lose all the water because the solution is hypertonic, and when there is excess of water in the stomach, the person starts vomiting.

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Answer 2

When a person takes concentrated salt solution, the concentration of water outside the cell becomes lower than that inside the cell. This results in exosmosis. This leads to reverse peristaltic movements of the food pipe and the person starts vomitting.