Podcast
Questions and Answers
Where do Ca ions bind to initiate contraction in cardiac muscle?
Where do Ca ions bind to initiate contraction in cardiac muscle?
- Sarcoplasmic reticulum
- Ryanodine receptor-channels
- Troponin (correct)
- Voltage-gated Ca2+ channels
What is the primary function of the NCX antiporter in cardiac muscle?
What is the primary function of the NCX antiporter in cardiac muscle?
- Pumping Ca back into the sarcoplasmic reticulum
- Initiating contraction by binding to troponin
- Inducing Ca release through ryanodine receptor-channels
- Exchanging Ca with Na+ (correct)
What causes the release of Ca sparks in cardiac muscle?
What causes the release of Ca sparks in cardiac muscle?
- Activation of the Na+-K+-ATPase
- Pumping Ca back into the sarcoplasmic reticulum
- Voltage-gated Ca2+ channels opening in the T-tubule
- Induction of Ca release through ryanodine receptor-channels (correct)
What happens during relaxation of cardiac muscle?
What happens during relaxation of cardiac muscle?
What is the main difference between cardiac muscle action potentials and action potentials in neural and skeletal muscle cells?
What is the main difference between cardiac muscle action potentials and action potentials in neural and skeletal muscle cells?
What happens during the phase labeled as '3' in the myocardial contractile cell action potential?
What happens during the phase labeled as '3' in the myocardial contractile cell action potential?
Why are cardiac action potentials unique compared to other cell types?
Why are cardiac action potentials unique compared to other cell types?
What happens during the refractory period in cardiac muscle?
What happens during the refractory period in cardiac muscle?
What is the role of Na+ channels in the propagation of action potentials through the heart tissue?
What is the role of Na+ channels in the propagation of action potentials through the heart tissue?
What is the function of Ca2+ channels during the myocardial contractile cell action potential?
What is the function of Ca2+ channels during the myocardial contractile cell action potential?
Which factor is used to infuse Dilan each week to manage his hemophilia A?
Which factor is used to infuse Dilan each week to manage his hemophilia A?
What is the primary cause of Jason's stroke?
What is the primary cause of Jason's stroke?
Which of the following is NOT a factor that prolongs vasoconstriction during the vascular phase of hemostasis?
Which of the following is NOT a factor that prolongs vasoconstriction during the vascular phase of hemostasis?
What factor is made by endothelial cells and platelets, and binds to both collagen and platelets during the platelet phase of hemostasis?
What factor is made by endothelial cells and platelets, and binds to both collagen and platelets during the platelet phase of hemostasis?
