Q. I. Myoglobin in very less quantity II. Appear pale or whitish III. Mitochondria are very few IV. Sarcoplasmic reticulum in large quantity Given characteristics of muscles fibres be long to

A) White fibres
B) Green fibres
C) Red fibres
D) Pink fibres
Explanation

White Skeletal Muscle (Fast twitch fibre) Their fibres are much thicker and of light colour due to the absense of myoglobin. The number of mitochondria is low in white fibres. They have little or no store of oxygen. They are meant for fast and strenous physical activity over a short duration as they get tired soon. They carryout anaerobic contraction with accumulating lactic acid, $e.g.,$ muscles of eye ball, flight muscle of fast flying birds such as sparrows

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.