1. Heart Day 5
Heart Sounds

2. 1. The events associated with one heartbeat.
Pg 79 HEART SOUNDS
1. The events associated with one heartbeat.
Diastole= relaxation, chambers fill with blood
Systole= contraction, chambers expel blood

3. Pg 79 HEART SOUNDS
2. Heart Sounds “Lub, Dub”
Sound 1=“Lub” (S1) is the sound of the atrioventricular valves (tricuspid and bicuspid) closing
ventricles are contracting (systole)
Atrioventricular
Semilunar
A heart murmur describes an extra sound in addition to the "lub-dub." Sometimes these extra sounds are simply the sound of normal blood flow moving through a normal heart. Other times, a murmur may be a sign of a heart problem.

4. Pg 79 HEART SOUNDS
Sound 2=“Dub” (S2) is the sound of the semilunar valves (pulmonary and aortic) closing
ventricles are relaxing and filling with blood (diastole)
Atrioventricular
Semilunar
A heart murmur describes an extra sound in addition to the "lub-dub." Sometimes these extra sounds are simply the sound of normal blood flow moving through a normal heart. Other times, a murmur may be a sign of a heart problem.