Physiology: Muscle Fibres Flashcards
What is the speed and force of contraction a type 1 muscle fibre?
Slow and low
What is the speed and force of contraction of a type 2b muscle fibre?
Fast and high
Identify 3 characteristics of a type 1 muscle fibre
High capillary density
High levels of myoglobin
High number of mitochondria
High levels of triglyceride
High levels of oxidative enzymes
Identify 3 characteristics of a type 2b muscle fibre
High PC stores
High glycogen stores
Increased number of anaerobic enzymes
Large motor neurone
How does a high capillary density benefit type 1 muscle fibres?
Increases the number of sites available for diffusion
How does high levels of myoglobin benefit type 1 muscle fibres?
Allows the muscles to extract an increased amount of oxygen from the bloodstream
How does a high number of mitochondria benefit a type 1 muscle fibre?
Increase the amount of energy provided through aerobic respiration
How does high levels of triglyceride benefit a type 1 muscl fibre?
Can be broken down to produce fatty acids for energy production
How do high levels of oxidative enzymes benefit a type 1 muscle fibre?
Allow the performer to remove lactic acid from the muscle via oxidation
How does high PC stores benefit type 2b muscle fibres?
Allows the performer to use the ATP-PC system for longer
How do high glycogen stores benefit type 2b muscle fibres?
Increased energy source for ATP production via the lactate anaerobic system
How does an increased amount of anaerobic enzymes benefit a type 2b muscle fibre
Allows for a rapid breakdown of anaerobic energy sources
How does a large motor neurone benefit a type 2b muscle fibre
Allows the performer to control more muscle fibres per contraction
Which muscle fibres would a marathon runner predominantly use?
Type 1
Which muscle fibres would a sprinter predominantly use?
Type 2b
