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Muscle Contraction Mastery

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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</p> Signup and view all the answers

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

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

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.

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Description

Test your knowledge on the fascinating world of muscle contraction with this quiz! From the role of calcium ions to the importance of ATP, this quiz covers the fundamental mechanisms of skeletal and smooth muscle contraction. Take the quiz to learn about the key players involved in generating force in the cross-bridge cycle and how the balance between MLCK and MLCP activity determines muscle tone. Perfect for students of biology, anatomy or physiology, this quiz will help you master the complexities of muscle contraction.