HMS, BM EQ-Bank 32 MC Which characteristic best describes Type IIb (fast twitch) muscle fibres? High mitochondrial density Slow contraction speed Rapid force production High fatigue resistance Show Answers Only \(C\) Show Worked Solution C is correct: Type IIb fibres produce rapid, powerful contractions. Other Options: A is incorrect: Characteristic of Type I (slow twitch) fibres. B is incorrect: Type IIb fibres have fast contraction speeds D is incorrect: Type IIb fibres fatigue quickly