Physiology of Strength Training Part 1 – Muscle Function Skeletal Muscle Anatomy 660 muscles Approximately 45% of body weight 75% water, 20% protein (12% myofibullar and 8% enzymes, etc) 5% inorganic salts Largest organ system End organ for the primary support systems involved in exercise
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Part 1 – Muscle Function
Charged myosin head and covered active sites.
Uncovered active site; myosin head attaches.
Power stroke sliding actin inward; myosin head uncharged.
ATP separates and recharges myosin head.
ADP + P + energy
1. Motor Impulse
2. Neurotransmitter Substance
3. Action potential via Na and K
4. Calcium released exposing active sites
5. ATP split forming high energy myosin
6. Myosin attaches to actin forming a crossbridge
7. Stored energy released and crossbridge movement (Power Stroke)
8. ATP breaks myosin from actin
9. ATP splits forming high energy myosin