Question

a person drink concentrated salt solution and starts vomit why

Answer 1

Strong salt solutions are emetogenic because they chemically provoke the GI tract which is programmed to respond to any irritation by vomiting. 

Answer 2

because osmosis takes place inside our body in our cells the cell external environment becomes full of salt that is will be having only less amount of water so the water inside the cell goes out and the salt gets in to make a balance high consumption of salt water can cause death cuz of loss of so much water and we becomes dehydrated resuting in vomiting and all