Muscle Fibre Types

Question 1

What is type 1?

Answer 1

Slow oxidative
Endurance fibres
Small fibre and neutron size
Many capillaries and mitochondria
High myoglobin count
Low PC and glycogen stores

Question 2

What is type 2?

Answer 2

Fast oxidative glycolytic
Speed endurance fibres
Intermediate fibre and neurone size
Many capillaries and mitochondria
High myoglobin count
Intermediate glycogen and pc stores

Question 3

What is type 2b?

Answer 3

Fast glycolytic
Speed/ power fibres
Large fibre and neurone size
Few mitochondria and capillaries
Low myoglobin content
High pc and glycogen stores

Question 4

What is the motor unit?

Answer 4

A motor unit neurone plus all the muscle fibres it innervates and it’s function is to carry impulses from the central nervous system to the muscles fibres to initiate muscular contraction

Question 5

What is action potential?

Answer 5

This refers to the electrical impulse travelling down the motor unit.

Question 6

All or None law

Answer 6

All of the muscle fibres connected to the motor unit will contract or none will