Muscle Contraction Mastery

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Was ist der Auslöser für die Kontraktion der Skelettmuskulatur?

  • Eine Erhöhung der Konzentration von K+
  • Eine Erhöhung der Konzentration von Cl-
  • Eine Erhöhung der Konzentration von Na+
  • Eine Erhöhung der Konzentration von Ca2+ (correct)

Welche Art von Myosin-Molekülen benötigen eine Aktivierung durch Ca2+-abhängige Phosphorylierung?

  • Myosin-Moleküle in der quergestreiften Muskulatur
  • Myosin-Moleküle in der glatten Muskulatur (correct)
  • Myosin-Moleküle in der Herzmuskulatur
  • Myosin-Moleküle in der Skelettmuskulatur

Was bindet an Calmodulin, um Myosin Light Chain Kinase (MLCK) zu aktivieren?

  • Ca2+ (correct)
  • Na+
  • Cl-
  • K+

Was phosphoryliert Myosin Light Chain Kinase (MLCK)?

<p>Die regulatorischen leichten Ketten von Myosin (rMLC (D)</p> Signup and view all the answers

Was dephosphoryliert die regulatorischen leichten Ketten von Myosin (rMLC)?

<p>Myosin Light Chain Phosphatase (MLCP (A)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

  • Skeletal muscle contraction is triggered by an increase in Ca2+ concentration
  • Myosin molecules in skeletal muscle are always active
  • Myosin molecules in smooth muscle must be activated by Ca2+-dependent phosphorylation
  • Ca2+ binds to Calmodulin to activate Myosin Light Chain Kinase (MLCK)
  • MLCK phosphorylates the regulatory light chains of myosin (rMLC)
  • Phosphorylated rMLC can bind to actin and generate force in the cross-bridge cycle
  • ATP is required for both mechanical work and activation mechanism in smooth muscle
  • Myosin Light Chain Phosphatase (MLCP) dephosphorylates rMLC
  • Smooth muscle stays in an intermediate tension and phosphorylation state
  • The balance between MLCK and MLCP activity determines muscle tone.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Mastering Smooth Muscle Contraction
6 questions
Mastering Smooth Muscle Contraction
5 questions
Muscle Movement Mastery Quiz
15 questions
Use Quizgecko on...
Browser
Browser