Question

How does depolarisation at the sarcoplasmic reticulum cause muscle contraction?

Accepted Answer

- 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

Sarcoplasmic Reticulum Ca2+ Depolarisation Move Tropomyosin Actin Muscle