In: Anatomy and Physiology
You need to draw a 1-page chart with the 3 muscle fiber types. You need to include the type and size of that neuron that innervates that muscle. The predominant way ATP is produced for that muscle fiber type and 3 activities that are associate with that muscle fiber type.
Features | Type 1 | Type 2A | Type 2B |
Other names | Slow oxidative | Fast oxidative glycolytic (FOG) | Fast Glycolytic (FG) |
Type of neuron innervating the muscles | Motor neuron | Motor neuron | Motor neuron |
Size of neuron |
Small | Intermediate | High |
ATP production | ATP ( Derived from blood glucose + Free fatty acids ) is major source throughout .Aerobic Respiration is used for ATP production . | Aerobic Respiration but sometimes switch to Aerobic glycolyis . | Anerobic glycolysis . |
Glucose- is derived from |
Blood glucose -4 minutes Liver Glycogen -18 min Muscle glycogen-70 min Triglyceride of fatty tissue -4000min |
Muscle gycogen metabolised by anerobic glycolyis | Muscle Glycogen and metabolised by anerobic glycolysis. |
Colour | Red | Red | White |
Myosin ATP ase activity | Slow | Fast | Fast |
Oxidative capacity ,myoglobin content ,mitochondria ,capillary density | High | High | Low |
Glycolytic capacity | Moderate | High |
High |
Fatguability | Fatigue late (resistant) | Fatigue early ( Resistant ) | Fatigue earliest (fatiguable ) |
FUNCTION |
FOR LONG SLOW CONTRACTIONS So it is used In Marathon runners |
FOR FINE SKILLED MOVEMENTS It is used for sprinter(100 m runner ) |
For FIne skilled movements Sprinter (100 m runner ). |
Other functions | Maintain posture ,Bones and joint Stabilising,Small joints movement ,Isometric contraction | Used for walking | Used for rapid contractions for short time as it is fatigued easily . |