Share. By Alison Doyle. According to the Bureau of Labor Statistics, the median wage for workers in the United States at the end of September 2014 was $790 per week or $41,080 per year for a 40 hour work week. Wages were 2.5% higher than at the same date for the previous year.
Normal. The two major sounds heard in the normal heart sound like âlub dubâ. The â lubâ is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound,â dubâ or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.
Heartbeat Explained | Lub dub | Cardiac cycle | Human Anatomy and Physiology video 3D | elearnin. The valves of the chambers of the heart are made up of the muscles. This video depicts the rhythmic contractions and relaxations of the heart which constitute the heart beat. The heart continues to beat every moment in a person's life. Place your heart on the left side of your chest and you can feel your heartbeat. Doctors use stethoscope to feel your heartbeat. It is a device used to amplify the sound of your heart. It consists of a chest piece that carries a sensitive diaphragm, two ear pieces and a tube joining them.