Cardiac Physiology: Rhythms and Contractions Quiz

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What term refers to the mechanism that causes cells of the SA node to depolarize rhythmically?

Gated ion channels

Ventricular contraction

Conduction speed

Pacemaker potential (correct)

What is the general term for any abnormal cardiac rhythm?

Arrhythmia (correct)

Ectopic focus

Premature ventricular contraction

Sinus rhythm

What is the role of gated ion channels and specific ion inflows and outflows in creating the nodal rhythm?

Producing pacemaker potentials (correct)

Modulating ventricular contraction

Generating myocardial action potentials

Controlling conduction speeds

What is the mechanism that causes the twisting mode of ventricular contraction in the heart?

Tendinous cords Signup and view all the answers

Which wave of the ECG correlates with atrial systole?

P wave Signup and view all the answers

What is the specific term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Ectopic focus Signup and view all the answers

Why does the shape of a myocardial action potential differ from that of a neuron?

Different types of ion channels Signup and view all the answers

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

Subendocardial conducting network Signup and view all the answers

What is the significance of the plateau and unusually long refractory period of myocardial action potentials?

Supporting pumping effectiveness of the heart Signup and view all the answers

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Ectopic focus rhythm Signup and view all the answers

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

Calcium Signup and view all the answers

What causes cells of the SA node to depolarize rhythmically?

Pacemaker potentials Signup and view all the answers

Which wave of the ECG correlates with ventricular systole?

T wave Signup and view all the answers

What role do the tendinous cords play in the heart?

Preventing valvular prolapse Signup and view all the answers

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

Subendocardial conducting network Signup and view all the answers

What characteristic differentiates a nodal rhythm from a sinus rhythm?

Arising from an ectopic focus Signup and view all the answers

What does the graph of pacemaker potentials depict?

Time course and voltages of the pacemaker potentials Signup and view all the answers

What causes some changes in conduction speeds at different points along the path of excitation in the heart?

Myocardial action potentials Signup and view all the answers

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Ectopic focus Signup and view all the answers

What causes the twisting mode of ventricular contraction in the heart?

Tendinous cords Signup and view all the answers

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

Calcium Signup and view all the answers

What is the general term for any abnormal cardiac rhythm?

Arrhythmia Signup and view all the answers

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

Nodal rhythm Signup and view all the answers

What does the graph of the time course and voltages of the pacemaker potentials depict?

How cells of the SA node depolarize rhythmically Signup and view all the answers

What is the role of gated ion channels and specific ion inflows and outflows in creating the nodal rhythm?

Gated ion channels and specific ion inflows and outflows Signup and view all the answers

What characteristic differentiates a nodal rhythm from a sinus rhythm?

Rate of depolarization of SA node cells Signup and view all the answers

What is the general term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Ectopic focus Signup and view all the answers

What is the mechanism that causes cells of the SA node to depolarize rhythmically?

Pacemaker potentials Signup and view all the answers

What is the significance of the plateau and unusually long refractory period of myocardial action potentials?

To support the pumping effectiveness of the heart Signup and view all the answers

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

Subendocardial conducting network Signup and view all the answers

What characteristic differentiates a nodal rhythm from a sinus rhythm?

Origin of the rhythm Signup and view all the answers

What causes the twisting mode of ventricular contraction in the heart?

Tendinous cords Signup and view all the answers

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

Calcium Signup and view all the answers

What does the graph of pacemaker potentials depict?

Time course and voltages of the pacemaker potentials Signup and view all the answers

What wave of the ECG correlates with ventricular systole?

T wave Signup and view all the answers

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Ectopic rhythm Signup and view all the answers

What characteristic differentiates a nodal rhythm from a sinus rhythm?

Mechanism causing cells of the SA node to depolarize rhythmically Signup and view all the answers

What does the graph of pacemaker potentials depict?

Mechanism causing cells of the SA node to depolarize rhythmically Signup and view all the answers

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

Gated ion channels and specific ion inflows and outflows Signup and view all the answers

What causes the twisting mode of ventricular contraction in the heart?

Gated ion channels and specific ion inflows and outflows Signup and view all the answers

What ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

Calcium Signup and view all the answers

What wave of the ECG correlates with atrial systole?

P wave Signup and view all the answers

What role do the tendinous cords play in the heart?

Preventing valvular prolapse Signup and view all the answers

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

Gated ion channels Signup and view all the answers

Cardiac Physiology: Rhythms and Contractions Quiz

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Questions and Answers

What term refers to the mechanism that causes cells of the SA node to depolarize rhythmically?

What is the general term for any abnormal cardiac rhythm?

What is the role of gated ion channels and specific ion inflows and outflows in creating the nodal rhythm?

What is the mechanism that causes the twisting mode of ventricular contraction in the heart?

Which wave of the ECG correlates with atrial systole?

What is the specific term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Why does the shape of a myocardial action potential differ from that of a neuron?

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

What is the significance of the plateau and unusually long refractory period of myocardial action potentials?

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

What causes cells of the SA node to depolarize rhythmically?

Which wave of the ECG correlates with ventricular systole?

What role do the tendinous cords play in the heart?

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

What characteristic differentiates a nodal rhythm from a sinus rhythm?

What does the graph of pacemaker potentials depict?

What causes some changes in conduction speeds at different points along the path of excitation in the heart?

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

What causes the twisting mode of ventricular contraction in the heart?

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

What is the general term for any abnormal cardiac rhythm?

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

What does the graph of the time course and voltages of the pacemaker potentials depict?

What is the role of gated ion channels and specific ion inflows and outflows in creating the nodal rhythm?

What characteristic differentiates a nodal rhythm from a sinus rhythm?

What is the general term for any abnormal cardiac rhythm originating from a focus other than the SA node?

What is the mechanism that causes cells of the SA node to depolarize rhythmically?

What is the significance of the plateau and unusually long refractory period of myocardial action potentials?

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

What characteristic differentiates a nodal rhythm from a sinus rhythm?

What causes the twisting mode of ventricular contraction in the heart?

Which ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

What does the graph of pacemaker potentials depict?

What wave of the ECG correlates with ventricular systole?

What is the term for any abnormal cardiac rhythm originating from a focus other than the SA node?

What characteristic differentiates a nodal rhythm from a sinus rhythm?

What does the graph of pacemaker potentials depict?

What is responsible for changing conduction speeds at different points along the path of excitation in the heart?

What causes the twisting mode of ventricular contraction in the heart?

What ion is primarily responsible for the plateau and unusually long refractory period of myocardial action potentials?

What wave of the ECG correlates with atrial systole?

What role do the tendinous cords play in the heart?

What is responsible for the spread of excitation through the atria, AV node, AV bundle, and bundle branches?

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