The characteristic features of Myophosphorylase deficiency include

(D) All of the above # McArdle syndrome (type V):# Enzyme Deficiency:> Muscle phosphorylase# Morphologic changes:> Skeletal muscle only-accumulations of glycogen predominant in subsacrolemmal location.> Clinical features: Painful cramps associated with strenuous exercise. Myoglobinuria occurs in 50% of cases. Onset in adulthood (>20 year old). Muscular exercise fails to raise lactate level in venous blood. Compatible with normal longevity.