<prompt> The amino acid which serves as a carrier of ammonia from skeletal muscle to liver isAlanineMethionineArginineGlutamine  <response>: GLUCOSE-ALANINE CYCLE 1. Skeletal muscle transpos NH3 to the Liver in the form of the amino acid alanine. The alanine is formed in the muscle tissue by a transamination reaction between pyruvate PA and glutamate. 2. The alanine is transpoed through the bloodstream to the liver, where it reacts with a-ketoglutarate to reform Pyruvate and glutamate. This reaction is catalysed by alanine transaminase. 3. The nitrogen originating from the glutamate is processed by the urea cycle. 4. When the blood glucose is low, the Pyruvate resulting from alanine transamination is used to make glucose the gluconeogenesis pathway. 5. The glucose can be returned to the skeletal muscle to supply quick energy. Thus, the transpo of alanine from muscle to Liver results in a reciprocal transfer of glucose to muscle. The entire cyclical process is referred to as the glucose-alanine cycle Fig. 27.5. Its impoance is propoional to the muscular activity of the organism. It is to be noted that active muscle tissue operates anaerobically, producing large quantities of Pyruvate PA and consuming large quantities of glucoseRef: M.N. Chatterjea - Textbook of Biochemistry, 8th edition, page no: 483 