A student recently wrote us: "The answer choice D is explained incorrectly by saying that "there is no reason to believe glycogen would be stored in skeletal muscle cells" but the concept explanation says muscle and liver cells can store glucose as glycogen?"
Glycogen is definitely found and utilized by skeletal muscle cells for energy. However, this question is focused on glucagon receptors. Since skeletal muscle cells do not release glucose into circulation, glucagon receptors would be unnecessary on these cells and there would be no reason to think that skeletal muscle cells would be locations for the storage and release of glucose. The answer explanation has been modified to clarify this point.
Thanks for your question. I hope this helps!
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