When listening to a heartbeat it consists of two thumps. Is it contracting twice very quickly or is the second thump caused by something else?
In: Biology
A heart “beat” is actually a few processes happening at once. The first process is the top part of the heart (atria) contracting to fill the bottom part (ventricles). The top part squeezes blood through the tricuspid and mitral valves into their respective ventricles. These valves close and the second stage begins. The ventricles begin squeezing and then the aortic and pulmonic valves open allowing blood to exit. These valves close and the process begins again.
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