You know the feeling. When you first see your crush and your head starts spinning, your palms get sweaty, and your heart begins beating a mile a minute. Is this love? Or is it … an arrhythmia? The ...

S1 is the first heart sound that doctors can hear using a stethoscope. The vibrations that occur when the mitral and tricuspid valves in the heart close produce the S1 sound. There are two common ...

Researchers discover that heart cells in developing zebrafish start beating suddenly and all at once Becoming a full-fledged organism out of a handful of cells, complete with functioning tissues and ...

A fast heartbeat can be caused by emotions like stress or anxiety. Dehydration, or drinking caffeine or other stimulants, can ...