red muscle cell type II muscle cell type IIa muscle cell 2010-09-02T03:31:38Z A type II muscle cell that contains large amounts of myoglobin, has many mitochondria and very many blood capillaries. Type II A cells are red, have a very high capacity for generating ATP by oxidative metabolic processes, split ATP at a very rapid rate, have a fast contraction velocity and are resistant to fatigue. FMA:84415 fatigue resistant fast twitch muscle cell type IIa muscle fiber type 2a muscle cell type 2a muscle fiber fast twitch A BTO:0001813