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Questions and Answers
What is the primary function of the AV valves closing during ventricular contraction?
What is the primary function of the AV valves closing during ventricular contraction?
- To allow blood to flow from the ventricles into the atria
- To decrease blood pressure in the aorta
- To prevent blood from flowing back into the atria (correct)
- To increase blood pressure in the pulmonary artery
During which part of the cardiac cycle do the semilunar valves close?
During which part of the cardiac cycle do the semilunar valves close?
- During atrial contraction and systole
- During ventricular relaxation and diastole (correct)
- During ventricular contraction and systole
- During atrial relaxation and diastole
What is the name of the sound produced by the closing of the AV valves?
What is the name of the sound produced by the closing of the AV valves?
- S2
- S1 (correct)
- Lub-dub
- Dub-lub
What is the purpose of the semilunar valves closing?
What is the purpose of the semilunar valves closing?
What is the cardiac cycle stage when the lub sound is produced?
What is the cardiac cycle stage when the lub sound is produced?
The 'lub' sound is produced during the closure of semilunar valves at the beginning of diastole.
The 'lub' sound is produced during the closure of semilunar valves at the beginning of diastole.
During ventricular relaxation, the semilunar valves close to prevent blood from flowing back into the ventricles.
During ventricular relaxation, the semilunar valves close to prevent blood from flowing back into the ventricles.
The second heart sound (S2) is produced by the closing of the AV valves at the end of systole.
The second heart sound (S2) is produced by the closing of the AV valves at the end of systole.
The 'dub' sound is generated by the opening of the AV valves during ventricular relaxation.
The 'dub' sound is generated by the opening of the AV valves during ventricular relaxation.
During ventricular contraction, the AV valves snap shut to prevent blood flow from the aorta back into the ventricles.
During ventricular contraction, the AV valves snap shut to prevent blood flow from the aorta back into the ventricles.
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Study Notes
Heart Sounds
- The lub-dub sounds heard during auscultation of the heart are caused by the valves snapping shut.
- "Lub" (S1) is the sound of the AV valves closing during ventricular contraction, at the beginning of systole.
- This prevents blood from flowing back into the atria from the ventricles.
Valve Closures
- AV valves close during ventricular contraction, at the beginning of systole.
- Semilunar valves close during relaxation of ventricles, at the end of systole and beginning of diastole.
- This prevents blood from flowing back into the ventricles from the pulmonary artery and aorta.
Cardiac Cycle
- Ventricular contraction occurs at the beginning of systole.
- Relaxation of ventricles occurs at the end of systole and beginning of diastole.
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