Muscle Fibre Characteristics

Which type of muscle fibre is primarily used for explosive, high-intensity activities like sprinting?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Type III fibres

What is a key characteristic of slow-twitch muscle fibres that makes them suitable for endurance activities?

• High glycogen storage

• High oxidative capacity

• Low capillary density

• Fast contraction speed

Which muscle fibre type is known for having the highest fatigue resistance?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Type IIb fibres

Which muscle fibre type is most efficient for activities requiring sustained energy over long periods?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Type IIb fibres

Which characteristic is NOT associated with type I muscle fibres?

• High oxidative capacity

• High fatigue resistance

• Fast contraction speed

• High capillary density

Which muscle fibre type is primarily responsible for maintaining posture?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Type IIb fibres

Which muscle fibre type has the highest myoglobin content?

• Type I fibres

• Type IIa fibres

• Type IIx fibres

• Type IIb fibres

What is a distinguishing feature of type IIb muscle fibres compared to type I fibres?

• Higher oxidative capacity

• Higher contraction speed

• Higher capillary density

• Higher myoglobin content

Which muscle fibre type is least likely to be used during a long-distance swim?

• Type I fibres

• Type IIa fibres

• Slow twitch fibres

• Type IIx fibres

Explain the difference between type IIa and type IIx fast-twitch fibres.

• Type IIa fibres are more resistant to fatigue than type IIx fibres.

• Type IIx fibres have a higher oxidative capacity than type IIa fibres.

• Type IIa fibres are primarily used for short bursts of power.

• Type IIx fibres are more suited for endurance activities.