Podcast
Questions and Answers
What is the main function of the right side of the heart?
What is the main function of the right side of the heart?
- To receive oxygenated blood from the pulmonary circulation
- To pump blood to the body against low resistance and under low pressure (correct)
- To pump blood to the lungs against high resistance and under high pressure
- To pump blood to the systemic circulation through the aorta
What is the main function of the left side of the heart?
What is the main function of the left side of the heart?
- To receive deoxygenated blood from the systemic circulation
- To pump blood to the lungs against high resistance and under high pressure (correct)
- To pump blood to the pulmonary circulation through the pulmonary artery
- To pump blood to the body against low resistance and under low pressure
What is the name of the phase in the cardiac cycle when the heart muscle contracts to eject blood?
What is the name of the phase in the cardiac cycle when the heart muscle contracts to eject blood?
- Repolarization
- Systole (correct)
- Diastole
- Depolarization
What is the name of the phase in the cardiac cycle when the heart muscle relaxes to be filled with blood?
What is the name of the phase in the cardiac cycle when the heart muscle relaxes to be filled with blood?
What is the name of the wall of the left ventricle?
What is the name of the wall of the left ventricle?
What is the name of the blood vessels that carry deoxygenated blood from the body to the right atrium?
What is the name of the blood vessels that carry deoxygenated blood from the body to the right atrium?
What is the function of the atrium in the heart?
What is the function of the atrium in the heart?
During which phase of the action potential does depolarization occur in cardiac muscle fibers?
During which phase of the action potential does depolarization occur in cardiac muscle fibers?
What is the resting membrane potential of cardiac muscle fibers?
What is the resting membrane potential of cardiac muscle fibers?
Which ion channels are responsible for the depolarization phase in cardiac muscle fibers?
Which ion channels are responsible for the depolarization phase in cardiac muscle fibers?
What characterizes the repolarization phase of the action potential in cardiac muscle fibers?
What characterizes the repolarization phase of the action potential in cardiac muscle fibers?
What is the specific role of ventricular fibers in the heart's action potential?
What is the specific role of ventricular fibers in the heart's action potential?
During which phase of the action potential does the membrane potential return to +10 mV due to the outflow of K+ through K+ channels?
During which phase of the action potential does the membrane potential return to +10 mV due to the outflow of K+ through K+ channels?
What contributes to the prolonged plateau of the action potential in ventricular fibers?
What contributes to the prolonged plateau of the action potential in ventricular fibers?
Which phase is characterized by the closure of slow calcium-sodium channels and unopposed outflow of K+ until repolarization is complete?
Which phase is characterized by the closure of slow calcium-sodium channels and unopposed outflow of K+ until repolarization is complete?
What role do slow calcium-sodium channels play during the plateau phase of the action potential?
What role do slow calcium-sodium channels play during the plateau phase of the action potential?
What is the membrane potential during Phase 3 of the action potential?
What is the membrane potential during Phase 3 of the action potential?
What prevents the heart from developing sustained, tetanic contractions during the absolute refractory period?
What prevents the heart from developing sustained, tetanic contractions during the absolute refractory period?
