Podcast
Questions and Answers
What happens at 0mV in the cardiac action potential?
What happens at 0mV in the cardiac action potential?
- Both Ca++ channels close and K+ channels open (correct)
- K+ channels close
- Ca++ channels open
- Both Ca++ channels open and K+ channels close
What role do slow Ca++ channels play in the cardiac action potential?
What role do slow Ca++ channels play in the cardiac action potential?
- Maintaining the resting membrane potential
- Causing hyperpolarization
- Allowing for the plateau phase (correct)
- Initiating depolarization
If not for endocrine control, how many times per minute would the SA node fire?
If not for endocrine control, how many times per minute would the SA node fire?
- 50 - 70 times
- 80 - 90 times (correct)
- 120 - 130 times
- 100 - 110 times
Which component of the heart's conduction system has the lowest firing rate?
Which component of the heart's conduction system has the lowest firing rate?
What is another term used to refer to recording electrical signals of the heart?
What is another term used to refer to recording electrical signals of the heart?
What event marks the depolarization of the ventricles in the cardiac cycle?
What event marks the depolarization of the ventricles in the cardiac cycle?
What is the function of the atria in the heart?
What is the function of the atria in the heart?
Which device is designed to correct fibrillations in the heart?
Which device is designed to correct fibrillations in the heart?
Where is the base of the heart located?
Where is the base of the heart located?
What represents the amount of blood pushed out by the ventricles in one cycle?
What represents the amount of blood pushed out by the ventricles in one cycle?
Which artery carries deoxygenated blood?
Which artery carries deoxygenated blood?
What occurs during ventricular diastole in the cardiac cycle?
What occurs during ventricular diastole in the cardiac cycle?
Where is the myocardium located in the heart?
Where is the myocardium located in the heart?
What signifies the interruption in the normal conduction pathway of the heart?
What signifies the interruption in the normal conduction pathway of the heart?
What is the purpose of the serous pericardium layer in the heart?
What is the purpose of the serous pericardium layer in the heart?
During which phase of the cardiac cycle does blood flow into the atria and through into the ventricles?
During which phase of the cardiac cycle does blood flow into the atria and through into the ventricles?
What are auricles in the heart?
What are auricles in the heart?
Which heart sound is heard at the closing of the atrioventricular valves?
Which heart sound is heard at the closing of the atrioventricular valves?
What is the cause of heart murmurs?
What is the cause of heart murmurs?
What is the equation for Cardiac Output (CO)?
What is the equation for Cardiac Output (CO)?
What does the ejection fraction represent?
What does the ejection fraction represent?
What happens to Stroke Volume (SV) as heart rate increases during exercise?
What happens to Stroke Volume (SV) as heart rate increases during exercise?
What is the normal range for Ejection Fraction (EF)?
What is the normal range for Ejection Fraction (EF)?
Which layer lines the chambers filled with blood and covers the heart valves?
Which layer lines the chambers filled with blood and covers the heart valves?
What is the function of endothelins released by the endothelium?
What is the function of endothelins released by the endothelium?
What is the function of the septum in the heart?
What is the function of the septum in the heart?
Which chamber of the heart receives deoxygenated blood from the systemic circulation?
Which chamber of the heart receives deoxygenated blood from the systemic circulation?
What purpose do semilunar valves serve in the heart?
What purpose do semilunar valves serve in the heart?
Which structure connects chordae tendineae to close the mitral valve in the heart?
Which structure connects chordae tendineae to close the mitral valve in the heart?
What is the function of coronary circulation in the body?
What is the function of coronary circulation in the body?
Plateau phase in cardiac contractile cells involves which of the following ion channels?
Plateau phase in cardiac contractile cells involves which of the following ion channels?
