<prompt> Muscle phosphorylase deficiency leads to which glycogen storage disorder?Hers diseaseMcArdles diseaseCoris diseaseAndersen disease  <response>: Muscle phosphorylase deficiency leads to Mc Ardles disease. which is characterised by poor exercise tolerance, muscle glycogen being abnormally high and blood lactate level very low after exercise.MnemonicHers disease - Hepatic phorphorylaseAndersen disease - Branching enzymeCoris disease - Debranching enzyme.Mnemonic A for B, C for D 