Which heart sound is associated with closing of the atrioventricular valves during ventricular contraction?

Which heart sound is associated with closing of the atrioventricular valves during ventricular contraction?

• A. Dubb
• B. Lubb-Dubb
• C. Squelch
• D. Lubb

Answer: (D)

Valvular closures during the heartbeat create the sounds we hear. When the ventricles begin to contract, the pressure rises and the atrioventricular valves (mitral and tricuspid) snap shut to prevent blood from flowing back into the atria. This closure produces the first heart sound, described as “lubb.” The second heart sound, “dupp,” comes later when the semilunar valves close at the end of systole. So, the sound tied to closing of the AV valves during ventricular contraction is “lubb.”

Valvular closures during the heartbeat create the sounds we hear. When the ventricles begin to contract, the pressure rises and the atrioventricular valves (mitral and tricuspid) snap shut to prevent blood from flowing back into the atria. This closure produces the first heart sound, described as “lubb.” The second heart sound, “dupp,” comes later when the semilunar valves close at the end of systole. So, the sound tied to closing of the AV valves during ventricular contraction is “lubb.”