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Summary IB Sports Exercise and Health Science Notes (TOPIC 4: MOVEMENT ANALYSIS)
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4. 1 / Neuromuscular function
4. 2 / Joint and movement type
4. 3 / Fundamental of biomechanics
, 4.1.3 /
Explain how skeletal muscle contracts by the
filament
sliding theory
1) Nat enter the muscle and change the polyrization
in the fibril
myo
2) The sarcoplasmic reticulum releases calcium ions
↳ calcium bind to
ions troponin
3) Tropomyosin complex exposes the binding site
4) Myosin head creates a cross -
bridge with the actin
↳
power stroke takes place
5) Z lines come closer together
↳ H smaller
zone
gets
6) Myosin releases actin if new ATP appears
7) Myosin head reattached further down the actin
filament repeating the
cycle
↳ until
process goes on
acetylcholine -
esterase
breaks the acetylcholine down
4. 1. 4 / Explain how slow and fast twitch fibre
differ in structure and function
slow Fast Ia Fast Ib
Force 10W high high
production
slow fast fast
contraction speed
Aerobic high low low
capacity
low high high
Glycogen content
.
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