Podcast
Questions and Answers
What is the role of Ca++ channels at 0mV during repolarization?
What is the role of Ca++ channels at 0mV during repolarization?
- Binding to troponin for muscle contraction
- Allowing the myosin and actin cross bridge
- Opening to initiate repolarization
- Closing to prevent premature contractions (correct)
Which heart node would fire 80 - 100 times per minute without endocrine control?
Which heart node would fire 80 - 100 times per minute without endocrine control?
- Bundle branches
- SA node (correct)
- AV node
- Atrioventricular bundle
What is the function of slow Ca++ channels in the heart?
What is the function of slow Ca++ channels in the heart?
- Closing to prevent arrhythmias
- Initiating repolarization
- Allowing for the plateau phase (correct)
- Inducing myosin-actin cross-bridge formation
Which part of the heart has the lowest firing rate among the listed nodes and fibers?
Which part of the heart has the lowest firing rate among the listed nodes and fibers?
What is the primary purpose of an Electrocardiogram (ECG or EKG)?
What is the primary purpose of an Electrocardiogram (ECG or EKG)?
Which layer of the heart is the most superficial?
Which layer of the heart is the most superficial?
What is the purpose of the auricles in the heart?
What is the purpose of the auricles in the heart?
Which chamber of the heart connects to the pulmonary trunk?
Which chamber of the heart connects to the pulmonary trunk?
Where is the heart located in the body?
Where is the heart located in the body?
How many chambers does a typical heart have?
How many chambers does a typical heart have?
What separates the heart from other structures within the chest?
What separates the heart from other structures within the chest?
During which phase of the cardiac cycle does the P wave represent the depolarization of the atria?
During which phase of the cardiac cycle does the P wave represent the depolarization of the atria?
What is the function of an artificial pacemaker in relation to heart contractions?
What is the function of an artificial pacemaker in relation to heart contractions?
Which phase of the cardiac cycle is characterized by ventricular relaxation and semilunar valves closing?
Which phase of the cardiac cycle is characterized by ventricular relaxation and semilunar valves closing?
What is the main purpose of an AED (Automated External Defibrillator)?
What is the main purpose of an AED (Automated External Defibrillator)?
Which phase of the cardiac cycle involves the pumping of blood into circulation?
Which phase of the cardiac cycle involves the pumping of blood into circulation?
What is the average amount of blood pushed out by the ventricles in each heartbeat called?
What is the average amount of blood pushed out by the ventricles in each heartbeat called?
Which event in the cardiac cycle is associated with the first heart sound, S1?
Which event in the cardiac cycle is associated with the first heart sound, S1?
What condition might be present if both the S3 and S4 heart sounds are heard together?
What condition might be present if both the S3 and S4 heart sounds are heard together?
What calculation is used to determine the cardiac output (CO)?
What calculation is used to determine the cardiac output (CO)?
What is the normal range for ejection fraction (EF) in cardiac physiology?
What is the normal range for ejection fraction (EF) in cardiac physiology?
During exercise, how does an increase in heart rate (HR) affect cardiac output (CO)?
During exercise, how does an increase in heart rate (HR) affect cardiac output (CO)?
What is the target heart rate used to maintain high cardiac output during physical activity based on?
What is the target heart rate used to maintain high cardiac output during physical activity based on?
Which layer of the heart releases endothelins that act as strong vasoconstrictors?
Which layer of the heart releases endothelins that act as strong vasoconstrictors?
What is the role of the Fossa ovalis in the heart?
What is the role of the Fossa ovalis in the heart?
Which chamber of the heart receives deoxygenated blood from systemic circulation?
Which chamber of the heart receives deoxygenated blood from systemic circulation?
What is the function of the moderator band in the heart?
What is the function of the moderator band in the heart?
Why do semilunar valves produce an audible sound as they close?
Why do semilunar valves produce an audible sound as they close?
What is the purpose of anastomosis in coronary circulation?
What is the purpose of anastomosis in coronary circulation?
Which type of cardiac muscle cells are responsible for initiating and propagating action potentials?
Which type of cardiac muscle cells are responsible for initiating and propagating action potentials?
Where is the SA node located in the heart?
Where is the SA node located in the heart?
