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what crosses a membrane

A cell’s membrane plays a crucial role in regulating what substances enter and leave the cell. It is said to be selectively permeable, meaning that some substances are able to cross, while other substances cannot. In this discussion, you will explain what characteristics determine whether a substance is able to cross the cell’s membrane. To help explain your points, select one nutrient supplement that is commonly sold in pharmacies or grocery stores.

Your initial post (due Wednesday) should

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Include an explanation of what characteristics are typically found in substances that readily cross the membrane.
Include an explanation of what characteristics are typically found in substances that do not readily cross the membrane.
Explain how the characteristics of the membrane’s structure influence what is able to cross.
Select one nutrient supplement and provide its chemical structure.
Based on the supplement’s chemical structure, describe whether or not it is expected to cross the membrane. Be sure to include your reasoning.
Properly cite any sources that you use to support your ideas (you should use at least one source).