+A heartbeat is the rhythmic contraction and relaxation of the [Heart](/wiki/Heart), circulating [Blood](/wiki/Blood) throughout the body. This vital, self-sustaining rhythm is a fundamental indicator of life and physiological function.
+## See also
+- [Circulation](/wiki/Circulation)
+- [Pulse](/wiki/Pulse)
+- [Organ](/wiki/Organ)
... 1 more lines