The heart cycle: review

Abstract

Cardiac cycle is the expression referring to the events related to the flow and blood pressure that occur from the beginning of a heart beat until the next beat. This events involves atrial and ventricle contraction, shots of autorrhythmic fibers, opening and closing valves, at the cellular level involves depolarization and calcium entry, coupling of contractile proteins such as actin and myosin and so many other events that must work in synergy for appropriate heart function. This article aims to synthetize most important events that are part of the heart cycle. Keywords: