White fibres are present in

Muscles that react rapidly are composed mainly of "fast" (Type 2, white Muscle) fibres with only small numbers of the slow variety.Conversely, muscles that respond slowly but with prolonged contraction are composed mainly of "slow" fibres (Type 1, Red Muscle).Fast fibres have fewer mitochondria than do slow fibres, also because oxidative metabolism is secondary. A deficit of red myoglobin in fast muscle gives it the name white muscle.Guyton 13e pg:83