Muscle Fibres

What would the predominant muscle fibre type be for this athlete?

• Slow Twitch
• Fast Twitch A
• Fast Twitch B
• Combination of Slow and Fast

What are the characteristics of fast twitch muscle fibres?

• Explosive activities, fatigue slowly
• Endurance activities, fatigue slowly
• Explosive activities, fatigue quickly
• Endurance activities, fatigue quickly

What would the predominant muscle fibre type be for this athlete?

• Slow Twitch
• Fast Twitch A
• Fast Twitch B
• Combination of Fast A and Fast B

This is a muscle biopsy. What is the predominant muscle fibre type here?

• Slow Twitch
• Fast Twitch

A motor unit is made up of _______________.

• all the muscle fibers within a given muscle
• a motor neuron and the muscle fibers it innervates
• all the neurons going into an individual section of the body
• a fascicle and a nerve

Which one of the following is a key characteristic of slow twitch muscle fibers? 

• They contain large amounts of Mitochondria
• They are fast to fatigue
• They are recruited last
• They contain low numbers of Mitochondria

Muscle fatigue sets in due to the non-availability of 

• calcium
• ATP
• actin binding sites
• sodium

Fill-in-the-blank! Muscle, Fascicle, _____, Myofibril

• Muscle fibre
• Myofilament
• Sarcomere
• Actin 

Another name for Type II Fibres is....

• Fast Twitch
• Slow Twitch
• Medium Twitch
• Super Twitch

World-class sprinters can have up to ____ more of fast twitch muscle fibres in their body

• 20%
• 40%
• 60%
• 80%