Muscular System Lesson 3 Muscle Fibre Types

Question 1

How many muscle fibre types are there?

Answer 1

Muscle fibres fall into 2 main categories that are divided into 3 types.

Question 2

What are the 3 muscle fibre types?

Answer 2

Type 1
Type 2 A
Type 2 X

Question 3

What is type 1 muscle fibre?

Answer 3

Type 1 is a slow twitch. In type 1 muscle fibre you have low force of contraction and will contract slowly. You will have high resistance to fatigue, and is an aerobic exercise.

An example of a sporting activity that will use type 1 are marathon runners and a triathlete.

Question 4

What is a type 2 A muscle fibre?

Answer 4

Type 2 A is a fast twitch. You have a fast contraction and a medium force of contraction. You have medium resistance to fatigue and is an aerobic and anaerobic exercise. This is when you are not sprinting but you are a at a fast jog.
An example of a sporting activity that will use type 2 A are a 400m runner so you can overtake people in a race.and when your pressing in football.

Question 5

What is a type 2 X muscle fibre?

Answer 5

A type 2 X muscle fibre is a fast twitch. It has a very contraction and a high force of contraction. It has a low resistance to fatigue and is an anaerobic exercise.
An example of a sporting activity that will use type 2 X is a 100m sprinter or a weightlifter because it is a power and explosive muscle fibre. A 100m sprinter has a very fast contraction and low fatigue because they are only doing short term sprints.