Question

a person takes a concentrated salt solution . after some time he starts vomiting. what is the phenomena responsible or such a situation?

Answer 1

Hi there,
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The use of a salt solution containing excess of salt to cause vomiting has been in practice since a very long time. Salt has a water retention property. When a solution containing excess of salt is taken, then due to osmosis water will move into the intestine, putting pressure on the intestinal walls. This also causes nausea. The intestinal wall is not able to tolerate this strain, and hence this excess water retention causes vomiting. 

Thus we can say that the phenomena responsible for vomiting after taking a concentrated salt solution is osmosis. 
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Answer 2

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Answer: Concentration salt solution is a hypertonic solution (water concentration lower as compared to the cell) therefore it causes exosmosis. The outward movement of water from the cell results in irritation and excessive dehydration. This results in reverse movements and hence, vomiting.