Cardiac physiology ventricles, pushing open the tricuspid and mitral valves. As pressure drops within the ventricles, blood flows from the major veins into the relaxed atria and from there into the ventricles. Both chambers are in diastole, the atrioventricular valves are open, and the semilunar valves remain closed. The cardiac cycle is complete. One of the simplest methods of assessing the heart's condition is to listen to it using a stethoscope. In a healthy heart, there are only two audible heart sounds, called S1 and S2. The first heart sound S1, is the sound created by the closing of the atrioventricular valves
How Many More Years How Many More Years "How Many More Years" is a blues song written and originally recorded by Howlin' Wolf (born Chester Burnett) in July 1951. Recorded at the Memphis Recording Service – which later became the Sun Studio – it was released by Chess Records and reached no.4 on the "Billboard" R&B chart. Musician and record producer T-Bone Burnett has described "How Many More Years" as "in some ways... the first rock’n’roll song...". It was a double-sided hit with "Moanin' at Midnight", which reached no.10 on the R&B chart. After military service, Chester Burnett performed as a blues singer and