14 Questions
Where do Ca ions bind to initiate contraction in cardiac muscle?
Troponin
What is the primary function of the NCX antiporter in cardiac muscle?
Exchanging Ca with Na+
What causes the release of Ca sparks in cardiac muscle?
Induction of Ca release through ryanodine receptor-channels
What happens during relaxation of cardiac muscle?
Ca ions unbind from troponin
What is the main difference between cardiac muscle action potentials and action potentials in neural and skeletal muscle cells?
Cardiac action potentials have a higher permeability to ion X.
What happens during the phase labeled as '3' in the myocardial contractile cell action potential?
Ca2+ channels open; fast K+ channels close
Why are cardiac action potentials unique compared to other cell types?
They have a longer duration than action potentials in other cell types.
What happens during the refractory period in cardiac muscle?
Ion channels are inactivated, preventing further depolarization.
What is the role of Na+ channels in the propagation of action potentials through the heart tissue?
They generate local depolarization and activate adjacent Na+ channels.
What is the function of Ca2+ channels during the myocardial contractile cell action potential?
They close slowly while K+ channels open.
Which factor is used to infuse Dilan each week to manage his hemophilia A?
Factor VIII
What is the primary cause of Jason's stroke?
A blood clot
Which of the following is NOT a factor that prolongs vasoconstriction during the vascular phase of hemostasis?
Fibrinogen
What factor is made by endothelial cells and platelets, and binds to both collagen and platelets during the platelet phase of hemostasis?
von Willebrand factor
Test your knowledge of the muscle contraction process and calcium signaling pathway with this quiz. Covering topics such as calcium release, sparks, troponin binding, and relaxation, this quiz will challenge your understanding of the intricate process of muscle contraction at a cellular level.
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