muscular system

Question 1

what are the 3 muscle fibre types?

Answer 1

slow twitch = type 1
fast twith = type 2A
fast twitch = type 2B

Question 2

what are type 1 slow-twitch fibres?

Answer 2

• Slow contraction speed
• Used for endurance activities
• Uses aerobic energy system
• Low force of contraction for extended periods
• Fatigue resistant
• Contract repeatedly for continuous activity
  E.g. Marathon runner

Question 3

what are type 2A fast-twitch fibres?

Answer 3

• Intermediate speed of contraction
• Moderate force of contraction
• Generate greater force and more powerful contractions
• Fatigue resistance
• some aerobic characteristics
• can develop aerobic characteristics with training
  E.g. speed endurance-based activities (e.g. 400m, 800m run)

Question 4

what are type 2B fast-twitch fibres?

Answer 4

• Rapid contraction speed
• used for speed, strength and power based activities
• High force of contraction
• Purely anaerobic activities
• Fatigue very quickly
• Generate greater force and more powerful contraction
  E.g. 100m, 200m sprint, field events (throws/jumps), 50m freestyle

Question 5

define excitability

Answer 5

The ability to contract in response to chemical and/or electrical signals.

Question 6

define extensibility

Answer 6

The capacity of a muscle to stretch beyond its normal resting length.

Question 7

define contractability

Answer 7

The ability of a muscle to contract or shorten.

Question 8

define elasticity

Answer 8

The ability of a muscle to return to the original resting length after it has been stretched.