Only a certain amount of glucose can be stored in the muscles as glycogen. Any excess is converted and stored as fat in muscles and liver.

Question

BlackTom AI · Accepted Answer

Muscle and liver glycogen stores are limited, so when carbohydrate intake exceeds those storage capacities, excess glucose is converted into fatty acids and then triglycerides for long-term storage.

1) Relevant concepts and facts
- Glycogen is the short-term storage form of glucose, primarily in liver (≈80–120 g) and skeletal muscle (varies with body size; several hundred grams total). These are finite pools regulated by insulin and glycogen synthase.
- When glycogen synthase activity and storage capacity are saturated, glucose is rerouted into glycolysis, generating pyruvate, then acetyl-CoA.
- De novo lipogenesis (enzymes: pyruvate dehydrogenase → acetyl-CoA → acetyl-CoA carboxylase → fatty acid synthase) converts excess acetyl-CoA into fatty acids, which are esterified into triglycerides and stored mainly in adipose tissue, but also in liver and as intramuscular triglycerides.

2) Step-by-step reasoning
- Dietary carbohydrate → blood glucose rises → insulin secreted → promotes glucose uptake and glycogen synthesis in muscle and liver.
- Glycogen synthase adds glucose units until tissue-specific glycogen capacity is approached.
- Once glycogen stores are full and immediate energy needs are met, glycolysis increases; pyruvate is converted to acetyl-CoA.
- Acetyl-CoA is used in fatty acid synthesis; fatty acids + glycerol → triglycerides stored in adipose, and some accumulate in liver and muscle.

3) Calculations
- Not applicable here; the argument is qualitative and based on biochemical pathways and storage limits.

4) Why the correct answer is correct
- Biochemistry and physiology show limited glycogen capacity and an active metabolic pathway (de novo lipogenesis) that converts surplus carbohydrate to fat for long-term storage. Hence the statement is accurate.

5) Why the other option (False) is incorrect
- Saying False would deny the well-established limitation of glycogen stores and the conversion of surplus glucose to fat, which contradicts metabolic physiology.

6) Conclusion
- The statement is True. This matches the provided answer: True.

Only a certain amount of glucose can be stored in the muscles as glycogen. Any excess is converted and stored as fat in muscles and liver.True/False

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