What is the storage form of carbohydrate in the liver, muscles, and kidneys?

Question

BlackTom AI · Accepted Answer

The question asks: What is the storage form of carbohydrate in the liver, muscles, and kidneys? 
Option 1: lactic acid. This is a byproduct of anaerobic metabolism, not a storage form. It accumulates under low-oxygen conditions and can be converted back to glucose in the liver via the Cori cycle, but it is not how carbohydrate is primarily stored in tissues. 
Option 2: glucose. While glucose circulates in the blood as a readily usable sugar, tissues store energy in a more condensed polymer form rather than as free glucose. Glucose itself is not the storage reservoir in these organs. 
Option 3: adenosine triphosphate (ATP). ATP is the immediate energy currency used for cellular work, not a long-term storage form of carbohydrate. It reflects energy transfer and usage, but not storage. 
Option 4: glycogen. This is the branched polymer of glucose that serves as the storage form of carbohydrate in liver, muscle, and to a lesser extent kidneys. In the liver, glycogen serves to maintain blood glucose levels, while in muscles it provides a local energy source for contraction; kidneys also contain glycogen in smaller amounts for local energy needs. 
Overall, the options that describe byproducts or rapid-use forms (lactic acid, ATP) or circulating monosaccharide (glucose) do not capture the storage role that glycogen fulfills in these tissues. Therefore, the storage form of carbohydrate in these organs is glycogen.

What is the storage form of carbohydrate in the liver, muscles, and kidneys?单项选择题

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