Cardiac Fibrillation and Excitation Sequence Quiz

What is the primary function of the sinoatrial (SA) node?

Which structure is responsible for delaying the electrical signal to allow for complete atrial contraction before transmitting it to the ventricles?

Which structure conducts the electrical impulse from the AV node down the interventricular septum?

Which structure is responsible for rapidly distributing the electrical impulse throughout the ventricles, coordinating their contraction from the apex upward?

Which part of the brain controls sympathetic innervation of the heart, stimulating an increase in heart rate and contractility during times of stress or physical exertion?

Which phase of the cardiac action potential involves the influx of calcium ions through slow voltage-gated calcium channels and efflux of potassium ions, sustaining the depolarized state for prolonged contraction?

During which phase of the cardiac cycle do the ventricles contract, ejecting blood into the circulation?

Which phase of the cardiac cycle involves the ventricles relaxing isometrically, marking the beginning of diastole?

What is the term used to describe the chaotic electrical signals in the heart that impair its ability to pump blood effectively and can lead to life-threatening complications?

During which phase of the cardiac cycle does blood flow from the atria into the ventricles, filling them with blood?

What does the term 'End Diastolic Volume (EDV)' represent?

What is the relationship between End Diastolic Volume (EDV), End Systolic Volume (ESV), and Stroke Volume (SV)?

Which of the following statements about Cardiac Output is correct?

What is the equation for calculating Cardiac Output?

Which neurotransmitter is associated with the parasympathetic control of heart rate?

What is the effect of catecholamines (norepinephrine and epinephrine) on heart rate?

Which of the following factors influence stroke volume?

What is the primary determinant of cardiac output that can be influenced by factors such as autonomic nervous system activity, hormonal regulation, and physical activity?

Which of the following statements about End Systolic Volume (ESV) is correct?

What is the effect of acetylcholine on cardiac cells?

Which statement accurately describes the role of autorhythmic cells within the heart?

What is the primary characteristic that distinguishes autorhythmic cells from contractile cardiac cells?

Which event initiates the process of action potential generation in autorhythmic cells?

What is the primary event that occurs during the depolarization phase of an action potential in autorhythmic cells?

Which process is primarily responsible for the repolarization phase of an action potential in autorhythmic cells?

What percentage of cardiac muscle tissue is composed of autorhythmic cells?

What term is used to describe irregularities in the heart's rhythm that can result from abnormalities in the intrinsic conduction system?

Which ion primarily contributes to the depolarization phase of an action potential in autorhythmic cells?

Which statement accurately describes the role of potassium channels during the repolarization phase of an action potential in autorhythmic cells?

Which statement regarding the pacemaker potential in autorhythmic cells is accurate?