Podcast
Questions and Answers
What is the role of DHP receptors in excitation-contraction coupling?
What is the role of DHP receptors in excitation-contraction coupling?
- Open RyR Ca2+ release channels in sarcoplasmic reticulum (correct)
- Pump Ca2+ back into the sarcoplasmic reticulum
- Release Ca2+ from the sarcoplasmic reticulum
- Bind to troponin for actin-myosin binding
What happens when a decrease in free cytosolic [Ca2+] occurs during muscle relaxation?
What happens when a decrease in free cytosolic [Ca2+] occurs during muscle relaxation?
- Myosin heads execute power stroke
- Tropomyosin uncovers binding sites
- Ca2+ unbinds from troponin (correct)
- Actin filament slides toward the center of the sarcomere
During excitation-contraction coupling, what allows actin-myosin binding?
During excitation-contraction coupling, what allows actin-myosin binding?
- Binding of troponin to DHP receptors
- Release of Ca2+ from sarcoplasmic reticulum
- Ca2+ binding to troponin (correct)
- Opening of L-Type Ca channels
Which ion enters the cell as part of the muscle action potential initiation process?
Which ion enters the cell as part of the muscle action potential initiation process?
In excitation-contraction coupling, what combines with troponin to initiate muscle contraction?
In excitation-contraction coupling, what combines with troponin to initiate muscle contraction?
What phase of EC coupling involves the initiation of muscle action potentials?
What phase of EC coupling involves the initiation of muscle action potentials?
What is the role of tropomyosin during muscle contraction?
What is the role of tropomyosin during muscle contraction?
How does ATP contribute to muscle contraction?
How does ATP contribute to muscle contraction?
What initiates the power stroke in muscle contraction?
What initiates the power stroke in muscle contraction?
Which molecule is responsible for pulling tropomyosin away from actin's binding site?
Which molecule is responsible for pulling tropomyosin away from actin's binding site?
What is the significance of calcium ions in muscle contraction?
What is the significance of calcium ions in muscle contraction?
