Muscel Fibres Flashcards
Type 1 fibre and sport event
Marathon
Long duration, low intensity
Type 2a fibre sport event
400m sprint
Medium intensity medium duration
Type 2X fibre and sport event
100m sprint
Fast duration, high intensity
Type 11X - Fast glycolic
Anerobic
White
Low
Low
V high
Low
Low
High
V high
High
Low
Large
High
High
Low
Type 11 A- fast oxidative
Partially both
Pink
Mid
Mid
High
Mid
Mid
Mid
High
Mid
Mid
Mid
Mid
Mid
Mid
Type 1- slow twitch
Aerobic
Red
High
High
Low
High
High
Low
Low
Low
High
Small
Slow
Low
High
Type 1 - slow twitch
Lots of?
Resistant to?
Capable or repeated ….. through what?
Muscles often were?
List of mitochondria and myoglobin.
Resistant to fatigue.
Capable of repeated contractions through aerobic metabolism
Neck and spine
Type 2a- fast oxidative.
What colour?
Much what?
What type of muscle contractions
More prone to what?
Red/pink
Myoglobin and mitochondria
Fast and strong
Fatigue than type 1
Type 11X - Fast glycotyc
What colour?
Low what?
Produce what slowly? By what?
What power?
Rapid what?
Mainly where?
White
Low mitochondria and myoglobin
Produce ATP slowly by aerobic metabolism.
short fast power
Rapid fatigue
Arms.
Spatial summation what is it?
Staggered stimulation of the motor units and muscle fibres - or just the muscel. Causes a sustained contraction and reduces fatigue as there is breaks
Wave summation?
Prevents what?
Repeated and consistent stimulation of the muscle causing a tectanic contraction.
Prevents muscle twitching as there is repeated nerve impulses with no time to relax.
But repeated stimuli causes calcium build up and muscle contraction can be sustained
Each time an impulse reaches the muscle cell what happens?
Calcium is released
What is required for muscle contraction?
Calcium
What causes a tectanic contraction?
Calcium build up.
All or none law?
There must be a minimum level (threshold) of stimulation to start a contraction.
All muscle fibres within a single motor unit must be activated or there will be no contraction.
Graduation of contraction?
The ability of muscle to produce forces varying from very light to maximum in force or tension.
Muscle spindle. (6)
M
M
I
C
M. C
I
1 muscle is stretched
2 muscle spindles detect length and speed of stretch
3 information sent to cns
4 cns sends info to motor nueron
5 the mussel contracts to reduce stretch
6 injury is prevented
What is a motor unit?
Made up of motor neurons and fibres it stimulates
What type of summation does this represent?
Spatial
What do A and B represent?
A- wave summation
B- tectanic contraction.
