What does the term systole refer to?

Systole refers to the phase of the cardiac cycle during which the heart muscle contracts. This contraction is essential for pumping blood out of the heart and into the arteries, allowing for the delivery of oxygen and nutrients to the body's tissues. During systole, the pressure within the heart chambers rises significantly, which helps propel the blood forward. This process is a vital component of the overall functioning of the cardiovascular system, ensuring that oxygenated blood reaches various parts of the body efficiently.

While other phases of the cardiac cycle, such as diastole, involve relaxation and filling of the heart, systole specifically denotes the active contraction period. Understanding this distinction is important for comprehending how the heart operates as a pump, contributing to effective circulation and overall health.