The sliding filament theory of muscle contraction
involves
1. calcium ions releasing ATP for energy
2. calcium ions binding with troponin, which shifts
tropomyosin and allows the myosin-binding sites
on actin to be exposed
3. neuromuscular junctions directly producing the
movement of actin and myosin
4. actin filaments moving the myosin filaments in
each sarcomere
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STEP OF SLIDING FILAMENT THEORY
The sarcoplasmic reticulum stimulated to release calcium ions
Calcium ions bind to troponin
Cross bridges (on myosin) pull on actin (power stroke)
Cross bridge detaches from binding sites on actin
Muscle fiber lengthens & relaxes
Calcium ions actively pumped back into sarcoplasmic reticulum
It will be option B
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