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Questions and Answers
What is the main purpose of the atrial systole phase of the cardiac cycle?
What is the main purpose of the atrial systole phase of the cardiac cycle?
- To pump 30% of the blood into the ventricles (correct)
- To increase the pressure in the ventricles
- To increase the duration of the cardiac cycle
- To generate the P-wave in the ECG
How does an increase in heart rate (tachycardia) affect the duration of the cardiac cycle?
How does an increase in heart rate (tachycardia) affect the duration of the cardiac cycle?
- The duration of diastole decreases while systole remains unchanged (correct)
- The duration of systole increases while diastole decreases
- The duration of both systole and diastole decrease
- The duration of systole and diastole both increase
What is the typical duration of the ventricular systole phase of the cardiac cycle?
What is the typical duration of the ventricular systole phase of the cardiac cycle?
- 0.7 seconds
- 0.3 seconds (correct)
- 0.5 seconds
- 0.1 seconds
Which of the following events occurs during the cardiac cycle?
Which of the following events occurs during the cardiac cycle?
What is the relationship between atrial and ventricular systole during the cardiac cycle?
What is the relationship between atrial and ventricular systole during the cardiac cycle?
What is the typical duration of the entire cardiac cycle if the heart rate is 75 beats per minute?
What is the typical duration of the entire cardiac cycle if the heart rate is 75 beats per minute?
What is the purpose of the pulmonary capillaries mentioned in the text?
What is the purpose of the pulmonary capillaries mentioned in the text?
What is the function of the mitral (left A.V.) valve mentioned in the text?
What is the function of the mitral (left A.V.) valve mentioned in the text?
What is the role of the fibrous skeleton of the heart described in the text?
What is the role of the fibrous skeleton of the heart described in the text?
What is the significance of the intercalated discs mentioned in the text?
What is the significance of the intercalated discs mentioned in the text?
How are the cardiac muscle fibers described in the text?
How are the cardiac muscle fibers described in the text?
What is the arrangement of the cardiac muscle fibers described in the text?
What is the arrangement of the cardiac muscle fibers described in the text?
What is the cardiac property that refers to the ability of cardiac muscle fibers to respond to a stimulus of adequate strength and duration?
What is the cardiac property that refers to the ability of cardiac muscle fibers to respond to a stimulus of adequate strength and duration?
During which phase of the cardiac muscle action potential does rapid depolarization occur?
During which phase of the cardiac muscle action potential does rapid depolarization occur?
What is the resting membrane potential range of atrial and ventricular muscles?
What is the resting membrane potential range of atrial and ventricular muscles?
Which mechanism contributes to maintaining the resting membrane potential in cardiac muscle?
Which mechanism contributes to maintaining the resting membrane potential in cardiac muscle?
What phase of the cardiac muscle action potential represents a small rapid repolarization due to potassium outflow and chloride inflow?
What phase of the cardiac muscle action potential represents a small rapid repolarization due to potassium outflow and chloride inflow?
Which cardiac property relates to the ability of impulses to conduct through the heart tissue?
Which cardiac property relates to the ability of impulses to conduct through the heart tissue?
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