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Atrioventricular Node and Heart Automatism Quiz

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Atrioventricular Node and Heart Automatism Quiz

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Questions and Answers

What is the purpose of the compensatory pause in the heart?

It is long diastole, which is accompanied by the ventricular extrasystole (correct)

It is long diastole, which is accompanied by the auricular extrasystole

Diastole, which is going with blood ejection from the ventricles period

It is a phase of hyperpolarization in the action potential

Why does the heart muscle lack the ability for tetanic contractions?

Constricts by the 'all or nothing' law

Contracts slowly

Has a long duration of the absolute refractory period (correct)

Obeys to the law by Starling

What prevents the contracting myocardial proteins from responding to additional irritations during ventricular systole?

It contracts by the 'all or nothing' law

Absolute refractory phase accords to it (correct)

Heart muscle has an automatism

Situates under the permanent influence of the vagus nerve

Which ions play a key role in initiating the constricting process in cardiomyocytes?

Potassium and calcium ions Signup and view all the answers

What determines the force of heart muscle contraction?

Heart muscle irritation power Signup and view all the answers

Which property of myocardial cells involves a high amplitude of action potential?

Big duration of action potential Signup and view all the answers

What is the pacemaker of the first order?

Synoatrial node Signup and view all the answers

Which of the following is a property of heart conductive myocytes?

Rich in the sarcoplasma capacity Signup and view all the answers

What is called the heart's ability to get excited spontaneously?

Heart automatism Signup and view all the answers

Which component belongs to the heart's conductive system?

Synoatrial node Signup and view all the answers

What is the reason for the heart automatism caused?

Slow diastolic depolarization Signup and view all the answers

Which statement describes the heart pacemaker's automatism ability when it is closer to the arterial ending?

It is higher Signup and view all the answers

What is a characteristic feature of pacemaker cells related to their membrane potential?

Low membrane potential level Signup and view all the answers

What is 'low diastolic depolarization' in relation to cardiomyocytes?

Gradual spontaneous decreasing of the membrane potential during depolarization Signup and view all the answers

Why does slow diastolic depolarization occur in pacemaker cells?

Decreasing permeability of K+ for membrane Signup and view all the answers

Which structure is considered a latent pacemaker of the heart?

Purkinje fibers Signup and view all the answers

Why do latent pacemakers in the heart typically follow the sinoatrial node's rhythm?

Innervation and pacing property of the sinoatrial node Signup and view all the answers