Study Question Thirteen

• EXPLAIN excitation-contraction coupling and how it leads to the myofilament contraction cycle and how it relates to the sliding filament theory.

  Excitation-contraction coupling is the process where the action potential signals the release of calcium ions from the sarcoplasmic reticulum, triggering contraction. Released calcium ions bind to troponin, exposing active sites where myosin and actin connect.
• Explain excitation-contraction coupling and HOW it leads to the myofilament contraction cycle and how it relates to the sliding filament theory.

  From there, the myofilament contraction cycle can begin, which is where cross-bridge formations form and myosin pulls on acting, causing contracting until being reset for the next cycle.
• Explain excitation-contraction coupling and how it leads to the myofilament contraction cycle and HOW it relates to the sliding filament theory.

  This process of myosin pulling on action, or sliding filaments against one another, also explains the sliding filament theory.
• Excitation-contraction coupling is the process where the action potential signals the release of calcium ions from the sarcoplasmic reticulum, triggering contraction. Released calcium ions bind to troponin, exposing active sites where myosin and actin connect. From there, the myofilament contraction cycle can begin, which is where cross-bridge formations form and myosin pulls on acting, causing contracting until being reset for the next cycle. This process of myosin pulling on action, or sliding filaments against one another, also explains the sliding filament theory.