11 Questions
What is the role of DHP receptors in excitation-contraction coupling?
Open RyR Ca2+ release channels in sarcoplasmic reticulum
What happens when a decrease in free cytosolic [Ca2+] occurs during muscle relaxation?
Ca2+ unbinds from troponin
During excitation-contraction coupling, what allows actin-myosin binding?
Ca2+ binding to troponin
Which ion enters the cell as part of the muscle action potential initiation process?
Na+
In excitation-contraction coupling, what combines with troponin to initiate muscle contraction?
Calcium ions
What phase of EC coupling involves the initiation of muscle action potentials?
Excitation phase
What is the role of tropomyosin during muscle contraction?
Shifting to expose the myosin-binding site on actin
How does ATP contribute to muscle contraction?
Decreases the binding affinity between actin and myosin
What initiates the power stroke in muscle contraction?
Myosin binding to actin
Which molecule is responsible for pulling tropomyosin away from actin's binding site?
Troponin-Ca2+ complex
What is the significance of calcium ions in muscle contraction?
Inducing the power stroke
Test your knowledge on the process of Excitation-Contraction coupling in muscle cells. Learn about the sequential steps involving the opening of calcium channels, release of calcium ions, and actin-myosin interactions leading to muscle contraction and relaxation.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
