Muscle Fibres Educational Materials | Western Sydney University - Edubirdie

University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

450

Pages:

2
Author:

Mariam A. A.

Muscle fibres Type 1 • First recruitment Structure • Smallest diameter • High capillary density • Bright red colour • High mitochondria density • Has myoglobin - Hold O2 temporarily, and is able to drop of to tissues that need it Metabolite • Aerobic cellular respiration - Carbs, fats and proteins for energy - Oxidative phosphorylation • Low myosin ATPase activity - Won’t be able to deattach and attach myosin head quickly, as ATP will be converted into ADP at a much slower rate • Slow contractile force required • Flow fatigue resistance Function • Good for marathon runners • Anti-gravity - Helps maintain posture Type 2a Structure • Largest diameter • High capillary density, but because of diameter, is it not really a bright red, rather it is pinkish red • High mitochondria density • Descent amounts of myoglobin - Hold O2 temporarily, and is able to drop off to tissues that need it Metabolite • Aerobic cellular respiration - Carbs, fats and proteins for energy - Oxidative phosphorylation • Can also switch to anaerobic energy production - Glycolysis and creatine phosphate • High myosin ATPase activity • Moderate amount of contractile force • Moderate fatigue resistance - For anything that is between a 1 minute to less than 30 minutes • Fast contractility Function Good for walking and sprinting Metabolite • Anaerobic • Very high myosin ATPase activity • Very fast amount of force • Very rapid fatigue • Low fatigue resistance - For anything that is less than a minute • Fast contractility • CK -> CP + ADP -> ATP Function • Weight lifting • Hitting a baseball Type 2x Structure • Intermediate diameter • White pale pink fibres, as the capillary density will be low due to the high diameter • Low mitochondria density • Low amounts of myoglobin • High amounts of glycosomes for glycolysis

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