Depolarization at the sarcoplasmic reticulum causes Ca2+ to be released into the myofibrils, where it binds to tropomyosin, moving it away from actin's binding sites and allowing myosin heads to form cross-bridges.
- depolarisation at sarcoplasmic reticulum - Ca2+ channels open - Ca2+ move out into myofibrils from sarcoplasmic reticulum by facilitated diffusion - Ca2+ binds to Ca2+ receptors on tropomyosin - tropomyosin molecules move away from actin - reveals binding sites on actin - myosin heads can bind - cross-bridges can form
| Front | How does depolarisation at the sarcoplasmic reticulum cause muscle contraction? |
|---|---|
| Back | - depolarisation at sarcoplasmic reticulum - Ca2+ channels open - Ca2+ move out into myofibrils from sarcoplasmic reticulum by facilitated diffusion - Ca2+ binds to Ca2+ receptors on tropomyosin - tropomyosin molecules move away from actin - reveals binding sites on actin - myosin heads can bind - cross-bridges can form |
Tags: muscles
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