Podcast
Questions and Answers
What type of tissue effectively provides insulation between the atria and the ventricles in the heart?
What type of tissue effectively provides insulation between the atria and the ventricles in the heart?
- AV bundle
- Annulus fibrosis (correct)
- SA node
- Purkinje fibers
Which factor affects myocardial excitability by decreasing it and can cause inactivation of atrial ectopic foci?
Which factor affects myocardial excitability by decreasing it and can cause inactivation of atrial ectopic foci?
- Sympathetic stimulation
- Parasympathetic stimulation (correct)
- Extracellular fluid ions concentration
- Hypercalcemia
What structure is the only conducting tissue between the atria and the ventricles in the heart?
What structure is the only conducting tissue between the atria and the ventricles in the heart?
- AV bundle (correct)
- Annulus fibrosis
- Purkinje fibers
- SA node
Which condition causes partial depolarization, initially increases myocardial excitability, but can lead to cardiac arrest if sustained due to channel inactivation?
Which condition causes partial depolarization, initially increases myocardial excitability, but can lead to cardiac arrest if sustained due to channel inactivation?
Which type of tissue behaves as a functional syncytium and obeys the 'all or none rule' in a manner similar to a single skeletal muscle fiber?
Which type of tissue behaves as a functional syncytium and obeys the 'all or none rule' in a manner similar to a single skeletal muscle fiber?
What is the region of the heart with the fastest intrinsic spontaneous discharge rate?
What is the region of the heart with the fastest intrinsic spontaneous discharge rate?
What is the main difference between cells of the conducting system and regular cardiac myocytes?
What is the main difference between cells of the conducting system and regular cardiac myocytes?
Which structure in the heart consists of modified ventricular muscle cells and has the largest diameter among all the heart cells?
Which structure in the heart consists of modified ventricular muscle cells and has the largest diameter among all the heart cells?
Which structure in the heart serves as an alternative, direct route for excitation to spread from atria to ventricles in Wolff-Parkinson-White (WPW) syndrome?
Which structure in the heart serves as an alternative, direct route for excitation to spread from atria to ventricles in Wolff-Parkinson-White (WPW) syndrome?
Through which specialized fibers does the wave of depolarization spread on the top of the ventricular septum?
Through which specialized fibers does the wave of depolarization spread on the top of the ventricular septum?
In a normal ECG, what direction does repolarization of the ventricle occur?
In a normal ECG, what direction does repolarization of the ventricle occur?
What is the function of the annulus fibrosis in the heart's conduction system?
What is the function of the annulus fibrosis in the heart's conduction system?
Which part of the heart experiences depolarization first in a normal cardiac impulse transmission?
Which part of the heart experiences depolarization first in a normal cardiac impulse transmission?
Where is the AV node situated in the heart?
Where is the AV node situated in the heart?
What characteristic arrhythmia can occur due to an electrical 'leak' between the atria and ventricles?
What characteristic arrhythmia can occur due to an electrical 'leak' between the atria and ventricles?
What is the significance of the AV node having the slowest conduction velocity in the heart?
What is the significance of the AV node having the slowest conduction velocity in the heart?
Which cardiac structure together with AV nodal tissue has the longest refractory period of any cardiac cells?
Which cardiac structure together with AV nodal tissue has the longest refractory period of any cardiac cells?
How is the AV nodal delay shortened or prolonged?
How is the AV nodal delay shortened or prolonged?
Which part of the heart has the slowest conduction velocity according to the given information?
Which part of the heart has the slowest conduction velocity according to the given information?
What is one of the functions of the AV node in transmitting electrical impulses?
What is one of the functions of the AV node in transmitting electrical impulses?
