relaxation and contraction of the heart
Two sounds
electrocardiogram
A pear as a fruit sounds like a pair meaning two.
Because two different parts have to contract, one after the other, to produce a pulse. The first to contract are the atria at the top of the heart, and then the ventricles below that do the main pumping.
Heart sounds are created primarily from turbulence in blood flow created by the closures of the valves.
If you're asking "Are abnormal heart sounds caused by valvular disease?," the answer is "sometimes." If you're asking "What are the abnormal heart sounds caused by valvular disease?," the answer is "it varies with the type and degree of disease." One of the most common abnormal heart sounds caused by valvular disease is a whooshing or swishing sound instead of the sharp thumping beat of a valve that's functioning properly.
what are fetal heart
Understanding Pediatric Heart Sounds was created in 2003.
Crepitus.Abnormal crackling sounds are called rales when heard on ausculation of the lungs, but called crepitus when heart in a joint, gangrenous skin, etc.
Understanding Pediatric Heart Sounds has 237 pages.
valves
The sounds in the heart are caused by the opening and closing of the ventricles. There are two sounds and they are called by the first heart sound (S1) and second heart sound (S2), produced by the closing of the AtrioVentricular valves and semilunar valves respectively.