Podcast
Questions and Answers
What happens to the Ca++ channels at 0mV during repolarization?
What happens to the Ca++ channels at 0mV during repolarization?
- They start a plateau phase
- They become inactive
- They open
- They close (correct)
Which component of the ECG represents the depolarization of the ventricles?
Which component of the ECG represents the depolarization of the ventricles?
- U wave
- P wave
- T wave
- QRS complex (correct)
What is the purpose of an artificial pacemaker in the heart?
What is the purpose of an artificial pacemaker in the heart?
- To record electrical signals
- To correct fibrillations
- To induce a long refractory period
- To deliver electrical impulses for effective contractions (correct)
What happens if the SA node were to fire 100 times per minute?
What happens if the SA node were to fire 100 times per minute?
How do slow Ca++ channels contribute to cardiac function?
How do slow Ca++ channels contribute to cardiac function?
What is the primary function of AEDs (Automated External Defibrillators) in cardiac emergencies?
What is the primary function of AEDs (Automated External Defibrillators) in cardiac emergencies?
What is the function of the atria in the heart?
What is the function of the atria in the heart?
Which structure is superior and medial to the apex of the heart?
Which structure is superior and medial to the apex of the heart?
What is the primary function of the myocardium?
What is the primary function of the myocardium?
Which vessel is the only artery to carry deoxygenated blood?
Which vessel is the only artery to carry deoxygenated blood?
Where are the great veins (superior and inferior vena cava) and arteries (aorta and pulmonary trunk) attached to the heart?
Where are the great veins (superior and inferior vena cava) and arteries (aorta and pulmonary trunk) attached to the heart?
Which layer of the heart produces lubricating fluid?
Which layer of the heart produces lubricating fluid?
What is the main function of endothelins released by the endothelium?
What is the main function of endothelins released by the endothelium?
Which of the following statements about the septum is correct?
Which of the following statements about the septum is correct?
What structures close the tricuspid valve to prevent backward flow into the right atrium?
What structures close the tricuspid valve to prevent backward flow into the right atrium?
Which chamber of the heart has a thicker muscle and no moderator band?
Which chamber of the heart has a thicker muscle and no moderator band?
What is the primary purpose of valves in the heart?
What is the primary purpose of valves in the heart?
Which statement about semilunar valves is accurate?
Which statement about semilunar valves is accurate?
What is the purpose of anastomosis in coronary circulation?
What is the purpose of anastomosis in coronary circulation?
What defines myocardial conducting cells from myocardial contractile cells?
What defines myocardial conducting cells from myocardial contractile cells?
Where are T-tubules predominantly located in cardiac muscle cells?
Where are T-tubules predominantly located in cardiac muscle cells?
What is the main role of desmosomes in cardiac muscle cells?
What is the main role of desmosomes in cardiac muscle cells?
Which structure functions as the normal pacemaker of the heart?
Which structure functions as the normal pacemaker of the heart?
What is the significance of plateau phase in cardiac contractile cells?
What is the significance of plateau phase in cardiac contractile cells?
