During prolonged starvation, the rate of gluconeogenesis depends on

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During prolonged starvation, the rate of gluconeogenesis depends on

    1. Increased alanine levels in liver
    1. Decreased cGMP in liver
    1. ADP in liver
    1. Decreased essential fatty acids in liver

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ANS

Increased alanine levels in liver

  • In the fasting state, there is a considerable output of alanine from skeletal muscle, far in excess of its concentration in the muscle proteins that are being catabolized.
  • It is formed by transamination of pyruvate produced by glycolysis of muscle glycogen, and is exported to the liver, where, after transamination back to pyruvate, it is a substrate for gluconeogenesis.
  • This is glucose-alanine cycle. Which has two major functions :-
  1. Transport of α -amino groups of ammino acids (ammonium ion/ammonia) from muscle to liver
  2. Transport of alanine as a substrate for gluconeogenesis