17 Questions
What is the purpose of the compensatory pause in the heart?
It is long diastole, which is accompanied by the ventricular extrasystole
Why does the heart muscle lack the ability for tetanic contractions?
Has a long duration of the absolute refractory period
What prevents the contracting myocardial proteins from responding to additional irritations during ventricular systole?
Absolute refractory phase accords to it
Which ions play a key role in initiating the constricting process in cardiomyocytes?
Potassium and calcium ions
What determines the force of heart muscle contraction?
Heart muscle irritation power
Which property of myocardial cells involves a high amplitude of action potential?
Big duration of action potential
What is the pacemaker of the first order?
Synoatrial node
Which of the following is a property of heart conductive myocytes?
Rich in the sarcoplasma capacity
What is called the heart's ability to get excited spontaneously?
Heart automatism
Which component belongs to the heart's conductive system?
Synoatrial node
What is the reason for the heart automatism caused?
Slow diastolic depolarization
Which statement describes the heart pacemaker's automatism ability when it is closer to the arterial ending?
It is higher
What is a characteristic feature of pacemaker cells related to their membrane potential?
Low membrane potential level
What is 'low diastolic depolarization' in relation to cardiomyocytes?
Gradual spontaneous decreasing of the membrane potential during depolarization
Why does slow diastolic depolarization occur in pacemaker cells?
Decreasing permeability of K+ for membrane
Which structure is considered a latent pacemaker of the heart?
Purkinje fibers
Why do latent pacemakers in the heart typically follow the sinoatrial node's rhythm?
Innervation and pacing property of the sinoatrial node
Test your knowledge on topics such as atrioventricular node automatism, rehabilitation of stimulation conduction, extrasystole, and compensatory pause in the heart's electrical system.
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