Podcast
Questions and Answers
What occurs at 0mV during repolarization?
What occurs at 0mV during repolarization?
- Ca++ channels open
- Ca++ channels close (correct)
- K+ channels open
- K+ channels close
What prevents premature contractions in the heart?
What prevents premature contractions in the heart?
- Fast Ca++ channels
- Long refractory period (correct)
- Calcium ion influx
- K+ channel inhibition
Which node would fire 80 - 100 times per minute without endocrine control?
Which node would fire 80 - 100 times per minute without endocrine control?
- Atrioventricular bundle
- Purkinje fibers
- SA node (correct)
- AV node
What component of an ECG records electrical signals of the heart?
What component of an ECG records electrical signals of the heart?
Which part of the heart has the lowest firing rate recorded at 28 BPM?
Which part of the heart has the lowest firing rate recorded at 28 BPM?
What is the approximate volume of fluid pumped by the heart per minute?
What is the approximate volume of fluid pumped by the heart per minute?
In the heart, where does the base location relative to the apex?
In the heart, where does the base location relative to the apex?
Which blood vessels attach at the base of the heart?
Which blood vessels attach at the base of the heart?
What is the function of ventricles in the heart?
What is the function of ventricles in the heart?
Which layer of the heart produces lubricating fluid in the pericardial cavity?
Which layer of the heart produces lubricating fluid in the pericardial cavity?
What is the middle thickest layer in the heart that consists of muscle cells, nerve fibers, and blood vessels?
What is the middle thickest layer in the heart that consists of muscle cells, nerve fibers, and blood vessels?
What does the T wave represent in the cardiac cycle?
What does the T wave represent in the cardiac cycle?
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 main function of an artificial pacemaker?
What is the main function of an artificial pacemaker?
What is the role of myoglobin in heart muscle cells?
What is the role of myoglobin in heart muscle cells?
Which valve closes during ventricular diastole?
Which valve closes during ventricular diastole?
What is the normal amount of blood pushed out by the ventricles during each heartbeat?
What is the normal amount of blood pushed out by the ventricles during each heartbeat?
Which heart sound is associated with the closing of atrioventricular valves?
Which heart sound is associated with the closing of atrioventricular valves?
What does S2, the second heart sound, represent?
What does S2, the second heart sound, represent?
Which condition is referred to as S7?
Which condition is referred to as S7?
What is the formula for Cardiac Output (CO)?
What is the formula for Cardiac Output (CO)?
What is the normal range for Ejection Fraction?
What is the normal range for Ejection Fraction?
What is the difference between Cardiac Reserve and Max HR?
What is the difference between Cardiac Reserve and Max HR?
'Target heart rate' refers to a range that aims to keep what high?
'Target heart rate' refers to a range that aims to keep what high?
'What can decrease heart rate among the following factors?'
'What can decrease heart rate among the following factors?'
Which layer of the heart covers the heart valves and is continuous with the lining of blood vessels?
Which layer of the heart covers the heart valves and is continuous with the lining of blood vessels?
What cells release endothelins and regulate growth patterns of cardiac muscle cells?
What cells release endothelins and regulate growth patterns of cardiac muscle cells?
Which valve separates the left atrium from the left ventricle?
Which valve separates the left atrium from the left ventricle?
In which chamber of the heart are pectinate muscles present?
In which chamber of the heart are pectinate muscles present?
Which part of the heart receives oxygenated blood from the pulmonary veins?
Which part of the heart receives oxygenated blood from the pulmonary veins?
What structure in the heart closes due to papillary muscles?
What structure in the heart closes due to papillary muscles?
What cells in the heart have a long refractory period to prevent tetany?
What cells in the heart have a long refractory period to prevent tetany?
Where is the Sinoatrial (SA) node located in the heart?
Where is the Sinoatrial (SA) node located in the heart?
What structure receives an impulse from the AV node and branches into right and left bundle branches?
What structure receives an impulse from the AV node and branches into right and left bundle branches?
What happens at +30mV in cardiac contractile cells during membrane potentials?
What happens at +30mV in cardiac contractile cells during membrane potentials?
