Podcast
Questions and Answers
What happens at 0mV in the cardiac cycle?
What happens at 0mV in the cardiac cycle?
- Ca++ channels open
- K+ channels close
- K+ channels open
- Ca++ channels close and K+ channels open (correct)
What is the role of Ca++ in muscle contraction?
What is the role of Ca++ in muscle contraction?
- Ca++ inhibits muscle contraction
- Ca++ binds to troponin to allow myosin and actin cross bridge (correct)
- Ca++ blocks cross-bridge formation
- Ca++ is not involved in muscle contraction
Which part of the heart has the lowest firing rate?
Which part of the heart has the lowest firing rate?
- Atrioventricular bundle
- AV node
- SA node
- Purkinje fibers (correct)
What is the purpose of an ECG or EKG?
What is the purpose of an ECG or EKG?
If the SA node was not under endocrine control, how many times would it fire per minute?
If the SA node was not under endocrine control, how many times would it fire per minute?
Where is the heart located?
Where is the heart located?
Which chamber of the heart collects blood and pushes it into the lower chambers?
Which chamber of the heart collects blood and pushes it into the lower chambers?
What is the purpose of auricles in the heart?
What is the purpose of auricles in the heart?
Which layer of the heart is the most superficial?
Which layer of the heart is the most superficial?
Where does CO2 leave and O2 enter in the pulmonary capillaries?
Where does CO2 leave and O2 enter in the pulmonary capillaries?
Which vessel is the only vein to carry oxygenated blood?
Which vessel is the only vein to carry oxygenated blood?
What does the P wave represent in the cardiac cycle?
What does the P wave represent in the cardiac cycle?
Which phase of the cardiac cycle involves the closure of semilunar valves and ventricular relaxation?
Which phase of the cardiac cycle involves the closure of semilunar valves and ventricular relaxation?
What is the main function of an artificial pacemaker in the heart?
What is the main function of an artificial pacemaker in the heart?
Which phase marks the pumping of blood into circulation during the cardiac cycle?
Which phase marks the pumping of blood into circulation during the cardiac cycle?
What is the primary purpose of AEDs in relation to the heart?
What is the primary purpose of AEDs in relation to the heart?
What represents the amount of blood left in the ventricles after stroke volume is pushed out?
What represents the amount of blood left in the ventricles after stroke volume is pushed out?
Which of the following is responsible for the first heart sound, S1?
Which of the following is responsible for the first heart sound, S1?
What does S4 indicate in terms of heart function?
What does S4 indicate in terms of heart function?
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 stroke volume (SV) based on end-diastolic volume (EDV) and end-systolic volume (ESV)?
What is the formula to calculate stroke volume (SV) based on end-diastolic volume (EDV) and end-systolic volume (ESV)?
Which factor can decrease heart rate according to the text?
Which factor can decrease heart rate according to the text?
Where does nervous control of heart rate primarily originate from?
Where does nervous control of heart rate primarily originate from?
What is the term used to describe increased ventricular stretch leading to more powerful contractions?
What is the term used to describe increased ventricular stretch leading to more powerful contractions?
During exercise, what happens to stroke volume as heart rate increases?
During exercise, what happens to stroke volume as heart rate increases?
What is the percentage range for normal ejection fraction?
What is the percentage range for normal ejection fraction?
'S7' is a term used when referring to which condition according to the text?
'S7' is a term used when referring to which condition according to the text?
What cell type in the heart is responsible for initiating and propagating the action potential through the heart?
What cell type in the heart is responsible for initiating and propagating the action potential through the heart?
Which structure ensures that cardiac muscle cells do not rip apart during contractions?
Which structure ensures that cardiac muscle cells do not rip apart during contractions?
What is the primary function of the Sinoatrial (SA) node in the heart?
What is the primary function of the Sinoatrial (SA) node in the heart?
Which structure receives impulses from the AV node and branches into right and left bundle branches?
Which structure receives impulses from the AV node and branches into right and left bundle branches?
What is the function of semilunar valves in the heart?
What is the function of semilunar valves in the heart?
During which phase of depolarization do cardiac contractile cells experience a plateau?
During which phase of depolarization do cardiac contractile cells experience a plateau?
What causes a heart murmur during auscultation?
What causes a heart murmur during auscultation?
Which heart chamber receives deoxygenated blood from systemic circulation?
Which heart chamber receives deoxygenated blood from systemic circulation?
