Question
Biology Question on locomotion and movement
Myoglobin is present in
all muscle fibres
white muscle fibres
red muscle fibres
both (b) & (c)
both (b) & (c)
Solution
Based upon the sarcoplasmic contents, situation of nuclei and number of formed elements, two types of fibres are recognised in striated muscles-white fibre and red fibre. White muscle fibres are fast muscle fibre which lack myoglobin and have fewer mitochondria. These muscles perform fast work for short duration as a result these muscle fibres get fatigued quickly. Eg.eye ball muscle,flight muscle of sparrow. Red muscle fibre are slow muscle fibre possessing red hemoprotein called myoglobin and abundant mitochondria. These muscles can perform slow sustained work over long period without getting fatigued. Eg. Extensor muscle at back and flight muscleinkites.