Splenius Capitis Muscle
Muscle contraction: Excitation-Contraction Coupling
In skeletal muscle fibers, electrochemical activity triggers myofilament movement. These linked events are referred to as excitation-contraction coupling.
The action potentials enter the muscle fiber from the sarcolemma and cause calcium ions (= Ca2+) to be released from the sarcoplasmic reticulum. A rise in cytoplasmic calcium initiates the contraction process.
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