Podcast
Questions and Answers
What happens at 0mV in terms of ion channels during repolarization of the heart?
What happens at 0mV in terms of ion channels during repolarization of the heart?
- Ca++ channels open and K+ channels close
- Ca++ and K+ channels both open
- Ca++ channels close and K+ channels open (correct)
- Ca++ and K+ channels both close
What is the function of Ca++ ions binding to troponin during muscle contraction?
What is the function of Ca++ ions binding to troponin during muscle contraction?
- Ca++ ions inhibit myosin and actin cross bridge formation
- Ca++ ions regulate heart rate
- Ca++ ions prevent muscle contraction
- Ca++ ions allow the myosin and actin cross bridge formation (correct)
If the SA node is not under endocrine control, how many times would it fire per minute?
If the SA node is not under endocrine control, how many times would it fire per minute?
- Between 80 - 100 times (correct)
- Less than 30 times
- Between 40 - 60 times
- Between 30 - 40 times
What is the purpose of an Electrocardiogram (ECG or EKG)?
What is the purpose of an Electrocardiogram (ECG or EKG)?
Which part of the heart has the lowest firing rate recorded?
Which part of the heart has the lowest firing rate recorded?
What is the primary function of the P wave in the cardiac cycle?
What is the primary function of the P wave in the cardiac cycle?
Which phase occurs when the semilunar valves are closed and blood flows into the atria and through into the ventricles?
Which phase occurs when the semilunar valves are closed and blood flows into the atria and through into the ventricles?
What is the primary function of an artificial pacemaker in cardiac muscle metabolism?
What is the primary function of an artificial pacemaker in cardiac muscle metabolism?
During ventricular diastole, what happens to the semilunar valves?
During ventricular diastole, what happens to the semilunar valves?
Which phase in the cardiac cycle involves an increase in pressure that forces the semilunar valves to open?
Which phase in the cardiac cycle involves an increase in pressure that forces the semilunar valves to open?
What is the main purpose of the QRS complex in the cardiac cycle?
What is the main purpose of the QRS complex in the cardiac cycle?
Where is the heart located in the body?
Where is the heart located in the body?
What is the function of the ventricles in the heart?
What is the function of the ventricles in the heart?
Which chamber of the heart connects to the pulmonary trunk?
Which chamber of the heart connects to the pulmonary trunk?
What is the purpose of the auricles in the heart?
What is the purpose of the auricles in the heart?
Which blood vessel is the only artery to carry deoxygenated blood?
Which blood vessel is the only artery to carry deoxygenated blood?
What is the middle thickest layer of the heart that contains muscle cells, nerve fibers, and blood vessels?
What is the middle thickest layer of the heart that contains muscle cells, nerve fibers, and blood vessels?
What are the audible sounds of a healthy heart?
What are the audible sounds of a healthy heart?
Which condition is referred to as S7?
Which condition is referred to as S7?
What is the formula for calculating Cardiac Output (CO)?
What is the formula for calculating Cardiac Output (CO)?
What is considered a normal range for Cardiac Output (CO) in liters per minute?
What is considered a normal range for Cardiac Output (CO) in liters per minute?
What is the percentage range for a normal Ejection Fraction?
What is the percentage range for a normal Ejection Fraction?
Where does nervous control of Heart Rate come from?
Where does nervous control of Heart Rate come from?
Which stimulation dominates the autonomic tone of the heart?
Which stimulation dominates the autonomic tone of the heart?
What happens to Stroke Volume (SV) if there is less filling time?
What happens to Stroke Volume (SV) if there is less filling time?
'Cardiac reserve' refers to:
'Cardiac reserve' refers to:
What increases the ventricular stretch leading to more powerful contraction of sarcomeres?
What increases the ventricular stretch leading to more powerful contraction of sarcomeres?
Which layer of the heart is described as the innermost layer that lines the chambers and covers heart valves?
Which layer of the heart is described as the innermost layer that lines the chambers and covers heart valves?
What cells release endothelins, strong vasoconstrictors that may regulate growth patterns of cardiac muscle cells?
What cells release endothelins, strong vasoconstrictors that may regulate growth patterns of cardiac muscle cells?
Which structure in the heart divides it into chambers and is described as physical extensions of the myocardium?
Which structure in the heart divides it into chambers and is described as physical extensions of the myocardium?
What is the function of the moderator band in the right ventricle of the heart?
What is the function of the moderator band in the right ventricle of the heart?
Which valve disorder is usually caused by inflammation?
Which valve disorder is usually caused by inflammation?
What is the function of coronary arteries in the heart?
What is the function of coronary arteries in the heart?
What is the role of gap junctions in cardiac muscle cells?
What is the role of gap junctions in cardiac muscle cells?
Where is the Sinoatrial (SA) node located in the heart, and what is its function?
Where is the Sinoatrial (SA) node located in the heart, and what is its function?
