Final answer:
Milk of Magnesia acts as a bulk-forming laxative by retaining water in the intestines to soften stool, and the basic environment of the small intestine allows both magnesium hydroxide and magnesium citrate to function as laxatives.
Explanation:
Milk of Magnesia is a suspension of magnesium hydroxide that acts as a bulk-forming laxative, promoting bowel movements by retaining water in the intestines to soften the stool.
The effectiveness of both magnesium hydroxide and magnesium citrate as laxatives in the small intestine is due to the fact that the contents of the small intestine are basic, creating an environment where these substances can exert their laxative effects.
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