An individual is constipated. They take magnesium salts to help loosen the stool. Why does this work?
A. Water moves from the intestines to the blood because the blood is hypertonic
B. Water moves from the intestines to the blood because the blood is hypotonic.
C. Water moves from the blood to the intestines because the blood is hypertonic
D. Water moves from the blood to the intestines because the blood is hypotonic.
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
Gather Content
· What do you know about osmosis? What other information is related to the question?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
D. Water moves from the blood to the intestines because the blood is hypotonic.
Clarify Question
· What is the key concept addressed by the question?
o The question asks about osmosis.
· What type of thinking is required?
o You are being asked to apply your knowledge about osmosis.
Gather Content
· What do you know about osmosis? What other information is related to the question?
o Osmosis occurs when water moves from a hypotonic region to a hypertonic region. When a person has constipation, they want more water to move from the blood into the intestines.
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
o By eating magnesium, they increase the concentration of salt in the intestines, making it more hypertonic. As a result water moves from the blood into the intestines..
Reflect on Process
· Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
o This question asked you to apply your knowledge about osmosis. If you got the correct answer, great job! If you got an incorrect answer, where did the process break down? Did you think that water moved towards a hypotonic solution? Did you think that to relieve constipation you wanted water to move out of the intestines?
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