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:muscle:Neuromuscular system :muscle: - Coggle Diagram
:muscle:
Neuromuscular system
:muscle:
Slow Twitch
Characteristics:
medium glyceride stores
high triglyceride stores
high resistance to fatigue
high oxidative enzymes
high capillary density
high myoglobin
high mitochondria
small fibre diameter
small motor neuron
low force + speed of contraction
high aerobic capacity - long endurance/low intensity - marathon
Slow Oxidative
Fast Twitch (IIa)
Characteristics:
some oxidative enzymes
high force + speed of contraction
high glycolytic enzymes
medium resistance to fatigue
high glycogen stores
medium motor neuron
some PC stores
high anaerobic capacity (some aerobic) - medium duration/high intensity - 400m sprint
Fast Oxidative Glycolytic
Fast Twitch (IIx)
Characteristics:
high PC stores
medium glycogen stores
large sarcoplasmic reticulum
v. high glycolytic enzymes
large fibre diameter
v. high force + speed of contraction
large motor neuron
very high anaerobic capacity - short duration/v. high intensity - shotput
Fast Glycolytic
Motor Unit Recruitment
A Motor Unit
"the motor neuron and the muscle fibres it stimulates"
Homogenous
= within each unit, ALL fibres are either slow twitch or ALL fast twitch
Summation
:electric_plug:
Spatial
spreading impulses to:
recruit more
recruit bigger
recruit faster
Tetanus
rapid firing
maintain a sustained and forceful contraction
Wave
send impulse before full relaxation
gradual increase in contractile force
'Stimulus Threshold'
amount of impulses needed to cause contraction
ALL or NONE law
either ALL fibres within a motor unit will contract or NONE will
dependent on levels of:
Electrolytes
Calcium ions
Acetyl Choline