Podcast
Questions and Answers
What happens at 0mV in terms of ion channel activity during repolarization?
What happens at 0mV in terms of ion channel activity during repolarization?
- Both Ca++ and K+ channels close
- Ca++ channels open and K+ channels close
- Ca++ channels close and K+ channels open (correct)
- Both Ca++ and K+ channels open
Which component allows for the plateau phase in the cardiac action potential?
Which component allows for the plateau phase in the cardiac action potential?
- Na+ channels
- K+ channels
- Cl- channels
- Ca++ channels (correct)
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?
- 40 - 60 times
- 60 - 80 times
- 100 - 120 times (correct)
- 20 - 30 times
What is the abbreviation commonly used for Electrocardiogram?
What is the abbreviation commonly used for Electrocardiogram?
Which part of the heart's electrical system has the lowest recorded firing rate?
Which part of the heart's electrical system has the lowest recorded firing rate?
What is the main function of P wave in the cardiac cycle?
What is the main function of P wave in the cardiac cycle?
Which structure is responsible for delivering electrical impulses to ensure effective heart contractions?
Which structure is responsible for delivering electrical impulses to ensure effective heart contractions?
What is the main purpose of AED's in cardiac care?
What is the main purpose of AED's in cardiac care?
During which phase of the cardiac cycle do the semilunar valves close?
During which phase of the cardiac cycle do the semilunar valves close?
What is the normal range for stroke volume in the cardiac cycle?
What is the normal range for stroke volume in the cardiac cycle?
Which phase of the cardiac cycle represents relaxation and closure of semilunar valves?
Which phase of the cardiac cycle represents relaxation and closure of semilunar valves?
What is the function of the atria in the heart?
What is the function of the atria in the heart?
Which structure in the heart is about the size of a typical athlete's fist?
Which structure in the heart is about the size of a typical athlete's fist?
What separates the heart from other structures surrounding it?
What separates the heart from other structures surrounding it?
Which layer of the heart produces lubricating fluid for the pericardial cavity?
Which layer of the heart produces lubricating fluid for the pericardial cavity?
Where do CO2 leave and O2 enter in the heart's pulmonary capillaries?
Where do CO2 leave and O2 enter in the heart's pulmonary capillaries?
What is the role of the auricles in the heart?
What is the role of the auricles in the heart?
What is the function of endothelium in the heart?
What is the function of endothelium in the heart?
How many septa are present in the heart?
How many septa are present in the heart?
Which chamber of the heart receives oxygenated blood from the pulmonary veins?
Which chamber of the heart receives oxygenated blood from the pulmonary veins?
What is the main function of the semilunar valves in the heart?
What is the main function of the semilunar valves in the heart?
What causes valve disorders in the heart according to the text?
What causes valve disorders in the heart according to the text?
What is the purpose of anastomosis in coronary circulation?
What is the purpose of anastomosis in coronary circulation?
What is the role of desmosomes in cardiac muscle cells?
What is the role of desmosomes in cardiac muscle cells?
Which structure in the heart sets the normal cardiac rhythm and is known as the pacemaker?
Which structure in the heart sets the normal cardiac rhythm and is known as the pacemaker?
What happens when cardiac contractile cells reach their plateau potential?
What happens when cardiac contractile cells reach their plateau potential?
What is the function of Purkinje fibers in the heart?
What is the function of Purkinje fibers in the heart?
What are the audible sounds of a healthy heart referred to as?
What are the audible sounds of a healthy heart referred to as?
When does S2 occur in the cardiac cycle?
When does S2 occur in the cardiac cycle?
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 for calculating Cardiac Output (CO)?
What is the formula for calculating Cardiac Output (CO)?
What is the percentage range for normal Ejection Fraction?
What is the percentage range for normal Ejection Fraction?
Which factor increases Cardiac Output by up to 8 times during activity?
Which factor increases Cardiac Output by up to 8 times during activity?
Where does nervous control of heart rate originate from?
Where does nervous control of heart rate originate from?
Which substance shortens the repolarization period in the heart due to sympathetic stimulation?
Which substance shortens the repolarization period in the heart due to sympathetic stimulation?
What is responsible for increasing ventricular stretch in the heart?
What is responsible for increasing ventricular stretch in the heart?
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