Podcast
Questions and Answers
What happens at 0mV in the cardiac action potential?
What happens at 0mV in the cardiac action potential?
- Ca++ channels and K+ channels both open
- Ca++ channels open and K+ channels close
- Ca++ channels and K+ channels both close
- Ca++ channels close and K+ channels open (correct)
What is the purpose of the long refractory period in the cardiac cycle?
What is the purpose of the long refractory period in the cardiac cycle?
- To accelerate the heart rate
- To initiate the plateau phase
- To promote premature contractions
- To prevent premature contractions (correct)
Which part of the heart's conduction system would typically fire the slowest?
Which part of the heart's conduction system would typically fire the slowest?
- SA node
- AV node
- Purkinje fibers (correct)
- Atrioventricular bundle
What is the purpose of Ca++ binding to troponin in muscle contraction?
What is the purpose of Ca++ binding to troponin in muscle contraction?
What is the purpose of an ECG or EKG recording?
What is the purpose of an ECG or EKG recording?
Where is the heart located in the body?
Where is the heart located in the body?
What is the function of the atria in the heart?
What is the function of the atria in the heart?
Which chamber in the heart is responsible for pumping blood to the body or lungs?
Which chamber in the heart is responsible for pumping blood to the body or lungs?
What is the main function of the pulmonary vein?
What is the main function of the pulmonary vein?
What is the role of the epicardium in the heart?
What is the role of the epicardium in the heart?
Which layer of the heart is considered the most superficial?
Which layer of the heart is considered the most superficial?
What is the main function of an artificial pacemaker?
What is the main function of an artificial pacemaker?
During which phase of the cardiac cycle does systole occur?
During which phase of the cardiac cycle does systole occur?
What is the main purpose of an AED (automated external defibrillator)?
What is the main purpose of an AED (automated external defibrillator)?
Which wave represents the repolarization of the ventricles in an electrocardiogram?
Which wave represents the repolarization of the ventricles in an electrocardiogram?
What phase of the cardiac cycle involves the closing of semilunar valves and opening of atrioventricular valves?
What phase of the cardiac cycle involves the closing of semilunar valves and opening of atrioventricular valves?
What is the purpose of myoglobin in heart cells?
What is the purpose of myoglobin in heart cells?
Which heart sound is associated with the closing of atrioventricular valves?
Which heart sound is associated with the closing of atrioventricular valves?
What is the normal range for Cardiac Output (CO) in liters per minute?
What is the normal range for Cardiac Output (CO) in liters per minute?
What is the formula to calculate Cardiac Output (CO)?
What is the formula to calculate Cardiac Output (CO)?
What does Ejection Fraction represent in cardiac physiology?
What does Ejection Fraction represent in cardiac physiology?
Which factor can decrease Heart Rate (HR) according to the text?
Which factor can decrease Heart Rate (HR) according to the text?
Where does nervous control of Heart Rate come from?
Where does nervous control of Heart Rate come from?
What is the main effect of sympathetic stimulation on the heart?
What is the main effect of sympathetic stimulation on the heart?
Which response best describes Ejection Fraction?
Which response best describes Ejection Fraction?
What is the impact of increased thyroid hormone levels on Heart Rate?
What is the impact of increased thyroid hormone levels on Heart Rate?
What happens to Stroke Volume if there is less ventricular filling time?
What happens to Stroke Volume if there is less ventricular filling time?
Which layer lines the chambers of the heart and covers the heart valves?
Which layer lines the chambers of the heart and covers the heart valves?
What are endothelins released by the endothelium known for?
What are endothelins released by the endothelium known for?
Which structure in the heart divides it into chambers?
Which structure in the heart divides it into chambers?
Which valve separates the left atrium from the left ventricle?
Which valve separates the left atrium from the left ventricle?
Why do semilunar valves make an audible sound when they close?
Why do semilunar valves make an audible sound when they close?
What is the function of papillary muscles in the heart?
What is the function of papillary muscles in the heart?
What is the main function of coronary circulation?
What is the main function of coronary circulation?
Which cell type initiates and propagates the action potential through the heart?
Which cell type initiates and propagates the action potential through the heart?
What is the main role of the SA node in cardiac conduction?
What is the main role of the SA node in cardiac conduction?
What is the significance of gap junctions in cardiac muscle cells?
What is the significance of gap junctions in cardiac muscle cells?
