BTEC Sport Revision- Muscle Fibre Types and Types of contraction

The video tutorial covers the three types of muscle contractions: isometric, concentric, and eccentric. It explains the all-or-none law, which states that muscles either fully contract or not at all. The tutorial also discusses different muscle fiber types, including type I, type IIa, and type IIx, and their roles in various sports. The video concludes with a brief mention of the next topic on muscular system responses to exercise.

Which type of muscle contraction occurs when the muscle length remains unchanged?

• Isometric contraction

• Eccentric contraction

• Dynamic contraction

• Concentric contraction

What type of contraction is happening when a muscle shortens during movement?

• Static contraction

• Concentric contraction

• Isometric contraction

• Eccentric contraction

During which phase does a muscle work eccentrically?

• Lifting a weight overhead

• Upward phase of a bicep curl

• Downward phase of a bicep curl

• Holding a plank position

What does the all-or-none law state about muscle contractions?

• Muscles can partially contract

• Muscles contract only when fully stimulated

• Muscles contract in varying degrees

• Muscles never fully relax

Which type of muscle fiber is known for being fatigue resistant and suitable for endurance activities?

• Type IIa fibers

• Fast-twitch fibers

• Type IIx fibers

• Type I fibers

What characteristic is associated with type IIx muscle fibers?

• High force production

• High endurance

• Rich in mitochondria

• Slow contraction speed

Which type of muscle fiber is more suitable for a 400-meter sprinter?

• Type IIx fibers

• Type IIa fibers

• Type I fibers

• Slow-twitch fibers