Question

Explain in detail; What are the differneces between red muscle fibres and white muscle fibres WITH FIVE POINTS.

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Answer 1

Ok by seeing the precaution early, I will purely apply by my means of context.
As you know, birds and mammals have in their skeletal muscles two kinds of strained fibres; red or slow muscle fibres and white or fast muscle fibres. So without wasting any more time let's jump to the differences between the latter two.

• Red muscle fibres are dark red which is due to their presence of red haemoprotein called myoglobin. Myoglobin binds and stores oxygen as oxyhaemoglobin (oxygen + haemoglobin) in the red fibres. Oxymyoglobin releases oxygen for utilization during muscular contraction.
• White muscle fibres are lighter in colour as they don't have any Myoglobin (hence the name of it)
• In Red muscle fibres, the mitochondria are more in number
• In white muscle fibres mitochondria are less in number.
• Red muscle fibres have less sarcoplasmic reticulum.
• White muscle fibres have more sarcoplasmic reticulum.
• Red muscle fibres carry out considerable amount of aerobic oxidation without accumulating much lactic acid (as of today clear oxygen debt which reverses the process). Thus red muscle fibres can contract for a longer period of time without any muscular fatigue.
• White muscle fibres depend upon, mainly on anaerobic oxidation (glycolysis) for energy production and accumulate lactic acid in considerable amounts during strenuous work or overload of the body and will soon get fatigued.
• Red muscle fibres have slow rate of contraction for longer periods
• White muscle fibres have a fast rate of contraction for short periods

Bonus (Example a must for understanding):
• Example of Red muscle fibre: Extensor muscles of the human back
• Example of white muscle fibre: The Eye ball muscles.

Answer 2

Red muscle quickly tire out but white muscles don't tired out quickly.